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Anglesite

Anglesite is a secondary lead sulfate mineral with the chemical formula PbSO₄, typically forming transparent to translucent, colorless to white crystals with an adamantine luster in the orthorhombic crystal system, and it arises as an oxidation product of primary lead sulfide ores like galena in weathered zones of lead deposits.^[1]^[2] Named in 1832 by François Sulpice Beudant after its type locality at Parys Mountain in Anglesey, Wales—where it was first identified in 1783 by William Withering—anglesite exhibits a Mohs hardness of 2.5 to 3, a high specific gravity of 6.3 to 6.4 due to its lead content, and may show tints of gray, yellow, green, blue, or other colors, while remaining colorless in transmitted light.^[1]^[2] It often occurs as prismatic or tabular crystals, sometimes in radiating clusters or as coatings, and is commonly associated with other secondary lead minerals such as cerussite and, less frequently, smithsonite.^[1]^[3] As one of the most common secondary lead minerals, anglesite serves primarily as an ore of lead, which is extracted for use in batteries, radiation shielding, and other industrial applications, though its soft nature and perfect cleavage limit its use as a gemstone to rare, faceted specimens prized for their high refractive index and brilliance comparable to diamond.^[2] Notable occurrences include Tsumeb in Namibia, Touissit in Morocco, Broken Hill in Australia, and Los Lamentos in Mexico, where gem-quality crystals have been found, making it a sought-after item for mineral collectors.^[2] Due to its lead content, handling anglesite requires caution to avoid inhalation of dust, as it poses health risks.^[1]

Etymology and history

Discovery

Anglesite was first described in 1783 by Reverend William Withering from specimens collected at Parys Mountain, Anglesey, Wales.^[4] Withering characterized it as a novel lead species mineralized by vitriolic acid and iron, present in vast quantities within the Parys Mountain copper mines.^[4] Initial observations noted its occurrence as a white, earthy alteration product of galena in lead mines, forming through oxidation processes in the upper zones of ore deposits.^[5]^[2] In the early 19th century, chemical analyses by mineralogists such as François Sulpice Beudant and others confirmed anglesite as a distinct sulfate mineral, separate from lead carbonates like cerussite and other compounds, through solubility tests and compositional breakdowns establishing its lead sulfate nature.^[6]

Naming

The mineral anglesite was officially named in 1832 by the French mineralogist François Sulpice Beudant, who proposed the term to honor its type locality at the Parys Mine on the Isle of Anglesey in Wales.^[1]^[4] This naming occurred nearly five decades after its initial identification in 1783 by William Withering, reflecting the gradual formalization of mineral descriptions during that era.^[4] Anglesite's recognition as a member of the baryte group stems from its isomorphous relationships with barite (barium sulfate) and celestine (strontium sulfate), sharing the same orthorhombic crystal structure and sulfate anion composition.^[7]^[8] These structural similarities, first systematically explored in the early 19th century, allowed for substitutions among lead, barium, and strontium in the sulfate series, influencing its classification within the group.^[8] In the early 19th century, mineralogical naming conventions emphasized locality-based terms, especially for species identified in prominent mining districts, as seen in Beudant's comprehensive treatises like his 1832 revision of Traité élémentaire de minéralogie, where he coined numerous names to standardize the field amid rapid discoveries.^[9]^[10] This approach contrasted with earlier 18th-century practices that often relied on descriptive or chemical terms, promoting a more systematic and geographic etymology that persists in modern mineralogy.^[10]

Physical properties

Appearance and crystal habit

Anglesite typically forms prismatic orthorhombic crystals characterized by sharp edges and vertical striations along the prism faces, particularly on {210} and {100} planes.^[1] These crystals often exhibit a rhomboidal cross-section and may be elongated along the c-axis, with pointed terminations enhancing their distinct morphology. Common habits include thin to thick tabular crystals on {001}, sometimes with rhomboidal outlines formed by {210} and {101} faces, as well as equant or pyramidal forms involving {111} and {211}.^[1] It also occurs in massive, granular, compact, nodular, or stalactitic aggregates, reflecting its variable growth conditions in lead-rich deposits.^[11] Transparent, gemmy crystals are rare but can reach several centimeters in length, such as prismatic specimens up to 2.4 cm from select localities.^[12] Twinning is uncommon in anglesite, though substrate-induced coalescence can produce rare twins on {110} or {021}.^[13]

Hardness, density, and fracture

Anglesite exhibits a Mohs hardness of 2.5–3, rendering it relatively soft and susceptible to scratching by common materials such as a fingernail or copper coin.^[14] This low hardness value places it among softer minerals, limiting its use in applications requiring durability.^[1] The specific gravity of anglesite ranges from 6.37 to 6.39, significantly higher than many common minerals due to its substantial lead content in the formula PbSO₄.^[14] This density makes anglesite feel unusually heavy for its size, a characteristic often noted in hand samples from lead deposits.^[1] Anglesite displays a conchoidal fracture and possesses brittle tenacity, meaning it breaks irregularly under stress without significant plastic deformation.^[14] These properties contribute to its tendency to shatter rather than bend, consistent with its orthorhombic crystal structure.^[1]

Optical properties

Color, luster, and streak

Anglesite typically exhibits a colorless to white body color, though it is commonly tinted gray, and less frequently orange, yellow, green, blue, or rarely violet, due to trace impurities from associated minerals in its formation environment.^[14] These color variations arise primarily from inclusions or oxidation products in lead-bearing deposits, with the mineral appearing colorless under transmitted light.^[1] The luster of anglesite is predominantly adamantine to resinous or vitreous, imparting a brilliant, gem-like sheen to well-formed crystals that enhances its visual appeal.^[14] In earthy or massive varieties, however, the luster can transition to dull, resulting from altered surface textures or finer-grained aggregates.^[2] Regardless of its body color or luster variations, anglesite produces a consistent white streak when powdered, a property that aids in its identification in the field.^[15]

Transparency and refractive indices

Anglesite exhibits varying degrees of transparency depending on its form, ranging from transparent in well-formed crystals to translucent or opaque in massive varieties.^[14] Clear, colorless crystals are prized for their optical clarity, allowing light to pass through with minimal scattering, while earthy or massive aggregates appear opaque due to internal impurities and grain boundaries.^[1] The mineral's optical behavior is characterized by its refractive indices, which are α = 1.877, β = 1.883, and γ = 1.894, indicating a biaxial positive crystal system.^[14] This results in a weak birefringence of δ = 0.017 (γ - α), producing subtle double refraction that is not strongly pronounced in most specimens.^[16] Anglesite displays strong dispersion with a value of 0.044 (r < v), comparable to that of diamond, which separates white light into spectral colors.^[16] Combined with its high refractive indices, this property imparts a fiery brilliance to faceted gemstones, enhanced further by the mineral's adamantine luster.^[14]

Chemical properties

Composition and formula

Anglesite is a lead sulfate mineral with the chemical formula PbSO₄.^[1]^[15] The ideal elemental composition by weight consists of 68.32% lead (Pb), 10.57% sulfur (S), and 21.11% oxygen (O).^[1]^[15] In terms of oxide equivalents, it corresponds to 73.60% PbO and 26.40% SO₃.^[15] Although rare due to differences in ionic radii, minor isomorphous substitutions can occur in the baryte group, with strontium (Sr) or barium (Ba) replacing lead (Pb) at low levels, as seen in varieties such as barytoanglesite.^[1]^[17]

Stability and solubility

Anglesite exhibits very low solubility in water, with a reported value of approximately 0.004 g/100 mL at 25°C, rendering it effectively insoluble under typical environmental conditions.^[18] However, it dissolves in concentrated sulfuric acid, particularly when hot, forming lead hydrogen sulfate, and is also soluble in ammonium acetate solutions at concentrations of 6 mol/L or higher.^[18] This selective solubility influences its behavior in geochemical processes, where it remains stable in sulfate-dominated, acidic settings but can dissolve under specific chemical treatments. Under surface oxidation conditions, anglesite is thermodynamically stable, commonly forming as a secondary mineral in the weathered zones of lead deposits.^[19] In carbonate-rich environments, however, it undergoes alteration to cerussite (PbCO₃), driven by the reaction with dissolved carbonate ions, which favors the more stable carbonate phase in mildly acidic to basic conditions.^[20]^[21] This transformation is prevalent in oxidized lead ores exposed to groundwater or atmospheric CO₂, highlighting anglesite's limited persistence in calcareous settings.^[22] In its pure, crystalline form, anglesite presents low acute toxicity due to its insolubility, which limits bioavailability and direct leaching of lead ions in neutral aqueous systems.^[1] Nonetheless, the high lead content (approximately 68% by weight) introduces significant environmental hazards in mining and processing contexts, where mechanical disturbance can generate respirable dust or facilitate lead mobilization into soils and water, contributing to broader lead contamination risks.^[18]^[23] Such exposures are associated with neurotoxic effects and ecosystem disruption, necessitating careful handling protocols in extraction operations.^[24]

Crystal structure

Symmetry and unit cell

Anglesite crystallizes in the orthorhombic crystal system with space group Pnma (equivalent to Pbnm in some settings).^[14] This symmetry results in crystals exhibiting three perpendicular axes of unequal length, consistent with the observed prismatic and tabular habits. The unit cell contains four formula units (Z = 4) and has dimensions a = 6.9549(9) Å, b = 8.472(1) Å, c = 5.3973(8) Å, yielding a volume of approximately 318.03 Å³. These parameters reflect the refined structure from single-crystal X-ray diffraction data on natural anglesite specimens. In the crystal structure, isolated SO₄ tetrahedra are linked through Pb²⁺ cations, each of which is coordinated to 12 oxygen atoms from six surrounding sulfate groups, forming a distorted polyhedron due to the stereochemically active lone pair on lead.^[25] The sulfate tetrahedra themselves are nearly rigid, with S–O bond lengths averaging about 1.47 Å and O–S–O angles close to the ideal tetrahedral value of 109.5°, exhibiting minimal distortion influenced by the cation field strength. This arrangement creates a framework where the tetrahedra share no edges or corners directly, but are bridged solely by the lead coordination.

Polymorphism

Anglesite represents the orthorhombic polymorph of lead(II) sulfate (PbSO₄), characterized by the space group Pnma.^[14] This structure aligns it within the barite group of minerals. While anglesite lacks common polymorphs under ambient conditions, experimental studies have identified high-pressure phases. A reversible phase transition occurs above approximately 23 GPa, transforming the barite-type structure (Pnma) to a denser post-barite-type polymorph with space group P2₁2₁2₁. This high-pressure form has been observed through in situ X-ray diffraction and Raman spectroscopy, reverting to the orthorhombic phase upon decompression, though the transition can be kinetically hindered in certain media.^[26] Anglesite is isostructural with barite (BaSO₄) and celestine (SrSO₄), sharing the orthorhombic sulfate framework that facilitates solid solutions, particularly in the BaSO₄-PbSO₄ series where complete miscibility has been demonstrated experimentally through hydrothermal synthesis of zoning-free crystals.^[27] Lanarkite, with the formula Pb₂(SO₄)O, is a monoclinic lead oxysulfate related to anglesite but distinct in composition and structure, often occurring as an associated secondary mineral in lead deposits.

Occurrence and formation

Geological formation processes

Anglesite primarily forms as a secondary mineral through the oxidation of primary lead sulfide minerals, such as galena (PbS), within the supergene zone of lead-bearing ore deposits.^[28]^[29] This process occurs near the Earth's surface where hypogene sulfides are exposed to weathering, leading to the chemical transformation of galena into lead sulfate (PbSO₄) as the end product.^[28] The reaction is driven by the interaction of galena with atmospheric oxygen, producing sulfate ions that combine with dissolved lead to precipitate anglesite.^[29] The formation requires the circulation of oxygenated meteoric waters through fractured ore bodies, which facilitate the dissolution and transport of lead and sulfate species under relatively acidic conditions (pH typically 0.4–5.0).^[28]^[30] These waters, often derived from rainfall or snowmelt, introduce oxygen and maintain moisture essential for ongoing oxidation, while sulfate ions—sourced from the breakdown of galena or associated sulfides—enable precipitation.^[28] This supergene alteration is favored in arid to semi-arid or temperate climates, where sulfate stability is preserved before potential conversion to more soluble carbonates in highly humid environments.^[31] A characteristic feature of anglesite formation is its pseudomorphic replacement of galena crystals, where anglesite inherits and preserves the original cubic morphology of the host mineral, often forming rims or infills along cleavage planes and grain boundaries.^[29]^[30] This replacement highlights the low-temperature, near-surface nature of the process, typically below 100 °C, and results in visually distinctive specimens that retain the structural outline of the precursor galena.^[29]

Associated minerals

Anglesite commonly occurs in association with galena, the primary lead sulfide mineral from which it often forms through oxidation, remaining as unaltered remnants in oxidized zones.^[1] Cerussite, a lead carbonate, frequently accompanies anglesite as a product of further alteration in carbonate-rich environments.^[32] Other secondary lead minerals such as pyromorphite and mimetite are typical associates, forming in lead-bearing oxidation zones where phosphate or arsenate ions are present.^[1] Hemimorphite, a zinc silicate, is also commonly found alongside anglesite in polymetallic deposits involving lead and zinc sulfides.^[33] In the oxidation zones of copper-lead deposits, anglesite may coexist with copper minerals including azurite and malachite, particularly where mixed sulfide ores have weathered.^[34] Associations with silver-bearing species, such as native silver or argentite, are rare, though trace silver can occasionally substitute in anglesite crystals.^[1] The paragenetic sequence typically involves early oxidation of galena to anglesite, followed by later transformation to cerussite under increasing carbonation conditions.^[35]

Distribution and localities

Type locality

The type locality of anglesite is Parys Mountain (Mynydd Parys), near Amlwch on the Isle of Anglesey, Wales, United Kingdom, a prominent volcanogenic massive sulfide deposit rich in copper, lead, and zinc ores.^[36] Mining at this site dates back to the Bronze Age around 4,000 years ago, with indications of Roman activity, though it flourished as one of the world's largest copper producers during the 18th century.^[37] The lead-bearing zones, including primary galena (PbS), underwent oxidation to form secondary minerals like anglesite in the gossan cap overlying the sulfide lodes.^[38] In the late 18th century, during operations targeting the oxidized gossan, early specimens of anglesite were identified from lead workings, appearing as white coatings on galena crystals in the weathering zone.^[36] These discoveries, documented around 1783 and later formalized as a new mineral species in 1832, highlighted the site's role in early mineralogy, with anglesite forming through the acidic alteration of galena under surface conditions.^[38]^[30] Parys Mountain reached peak production in the late 1700s, yielding over 3,300 tons of copper ore annually, while the lead deposits provided the initial anglesite material circa 1790–1800, though specimens are now rare due to extensive historical extraction.^[37] Today, the site is preserved as an industrial heritage area, managed for its geological and historical value, with no active mining.^[39]

Major global deposits

Anglesite occurs in several significant global deposits, primarily as a secondary mineral in the oxidized zones of lead-bearing ore bodies. One of the most renowned localities is the Touissit-Bou Beker district in Morocco, where gemmy, transparent crystals up to several centimeters in size have been extracted, prized for their clarity and luster.^[14] Similarly, the Tsumeb Mine in Namibia has yielded exceptional specimens, including large, well-formed prismatic crystals often associated with other secondary lead minerals, contributing to its status as a world-class site for collector material.^[14] In the United States, notable occurrences include the Grand Reef Mine in Graham County, Arizona, which has produced attractive, tabular crystals in vugs within a complex polymetallic deposit.^[14] The Bunker Hill Mine in Shoshone County, Idaho, is another key site, where blocky to tabular anglesite crystals up to 5 cm have been found in the oxidized portions of lead-zinc veins.^[40] Other important localities encompass Broken Hill in New South Wales, Australia, known for massive and crystalline anglesite in silver-lead-zinc deposits; the Monteponi Mine on Sardinia, Italy, yielding prismatic crystals; Los Lamentos in Chihuahua, Mexico, noted for gem-quality crystals; and regions in Siberia, Russia, such as Nerchinsk, where it forms in association with primary lead sulfides.^[14] Global production of anglesite remains minor, typically extracted as a byproduct during lead mining operations rather than as a primary target, with most output derived from the weathering of galena in supergene environments.^[41]

Uses and significance

As a lead ore

Anglesite, a lead sulfate mineral (PbSO₄), functions as a minor ore in the extraction of lead, typically forming in the oxidized supergene zones of primary lead sulfide deposits where galena (PbS) weathers. While galena dominates global lead production, anglesite supplements the supply in secondary enriched deposits, contributing to the overall recovery of lead from complex polymetallic ores. Its high lead content, approximately 68% by weight, makes it viable for industrial processing when concentrated.^[42]^[43] Beneficiation of anglesite-bearing ores begins with crushing and grinding to liberate the mineral from gangue, followed by physical separation techniques. Gravity separation, using jigs or shaking tables, exploits the density difference between anglesite (specific gravity ~6.3) and lighter gangue materials, often as a preliminary step to remove coarse fractions. For finer particles and mixtures with galena, froth flotation is employed, where collectors such as xanthates or hydroxamic acids selectively float lead minerals into a concentrate grading 50-70% lead, while depressants suppress unwanted sulfides. These methods yield a mixed lead concentrate suitable for smelting, with recovery rates typically exceeding 80% in optimized operations.^[44]^[45] The processed concentrate undergoes roasting at temperatures around 800-1000°C to decompose anglesite into litharge (PbO) and sulfur trioxide (SO₃), which can further decompose to sulfur dioxide (SO₂), via the reaction PbSO₄ → PbO + SO₃, regenerating sulfur for sulfuric acid production and avoiding direct sulfate smelting issues.^[46] The resulting litharge is then charged into a blast furnace along with coke and fluxes, where carbon reduction yields molten lead: PbO + C → Pb + CO. This two-stage thermal process integrates anglesite into conventional lead metallurgy, minimizing waste. Lead from such anglesite-bearing deposits bolsters global output, which reached about 12.3 million tonnes of refined lead in 2023 (as of 2024 data), primarily fueling lead-acid batteries (over 80% of consumption) and alloys for cables, radiation shielding, and ammunition.^[47]^[48]^[42]

Gemological and collectible value

Anglesite is rarely faceted into gemstones due to its relative softness, with a Mohs hardness of 2.5 to 3, and its perfect cleavage in three directions, which make it prone to chipping and difficult to cut and polish effectively.^[16]^[49] Despite these challenges, high-quality rough from select localities, such as Namibia and Morocco, yields attractive faceted stones that exhibit exceptional brilliance and a diamond-like fire owing to the mineral's high dispersion of 0.044 and adamantine luster.^[16]^[50] These gems are typically small, ranging from 1 to 6 carats, and are prized by collectors for their rarity and optical appeal rather than everyday jewelry use.^[16] In the gem market, faceted anglesite commands prices of approximately $30 to $80 per carat, varying by color—colorless stones at the lower end, with deeper yellow or tinted varieties fetching higher values—reflecting its scarcity and the skill required to facet it successfully.^[51]^[52] As a collectible mineral, anglesite is highly regarded for its cabinet specimens, particularly the large, transparent, prismatic crystals that can reach up to 10 cm in length, often displaying gemmy clarity and a vitreous to adamantine sheen.^[49] These specimens, sourced primarily from historic deposits like Tsumeb in Namibia and Touissit in Morocco, are valued for their aesthetic qualities, including well-formed habits and associations with other lead minerals.^[50] Market values for such cabinet-sized pieces typically range from $50 to $500, depending on crystal size, transparency, and overall aesthetics, with exceptional examples exceeding this range.^[53]^[54]

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[49]
Anglesite gemstone information - Gemdat.org
Anglesite forms transparent colourless crystals, often with yellow, green or blue shades. ... Optical Properties of Anglesite. Refractive Index, 1.877 to 1.894.
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Anglesite Gemstone: Properties, Meanings, Value & More
### Summary of Anglesite Discovery and First Description
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[PDF] ANGLESITE - Gemworld International
Anglesite is a mineral species—a lead sulphate with the formula PbSO4. It is formed by the oxidation of galena, a lead sulfide (PbS).
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How Much is Anglesite Worth per Carat, Gram? (2024 Values)
Aug 13, 2023 · Medium to Large Faceted Anglesite = $33.00 – $200.00 price per carat. Only sourced from gem dealers dealing in rare gemstones; Anglesite is ...
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Anglesite Mineral Specimens for Sale
Availability: Available ; Price: $25.00 ; Locality: Northwest of Sasabe, Arizona, United States ; Formula: PbSO ; Size: 8 x 5 x 3.5 cm - Sm Cabinet.Missing: large | Show results with:large
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https://www.irocks.com/minerals/species/buy-anglesite-fine-mineral-specimens-photos