Anglesite
Anglesite is named after the type locality on Anglesey, an island off the north coast of Wales.
Anglesite forms transparent colourless crystals, often with yellow, green or blue shades. Anglesite is cut into attractive faceted stones, but it is brittle and sensitive to heat.
Fine crystals are found at various places in the USA, in the Leadhills district, Scotland and the best cuttable material comes from the Touissit mine, Oujda, Morocco.
General Information |
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Chemical Formula | Michael O’Donoghue, Gems, Sixth edition (2006) More from other references |
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Photos of natural/un-cut material from mindat.org |
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Physical Properties of Anglesite |
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Mohs Hardness | 3 to 3.5Walter Schumann, Gemstones of the world (2001) More from other references |
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Specific Gravity | 6.30 to 6.39Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Tenacity | BrittleHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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Cleavage Quality | DistinctUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Fracture | ConchoidalArthur Thomas, Gemstones (2009) |
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Heat Sensitivity | SensitiveArthur Thomas, Gemstones (2009) |
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Optical Properties of Anglesite |
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Refractive Index | 1.877 to 1.894Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Optical Character | Biaxial/+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Birefringence | 0.017Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Pleochroism | NilArthur Thomas, Gemstones (2009) |
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Dispersion | 0.044Arthur Thomas, Gemstones (2009) |
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Colour |
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Colour (General) | Colourless, yellow, greenish, brownish, white.Walter Schumann, Gemstones of the world (2001) More from other references |
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Transparency | Transparent,TranslucentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Lustre | Adamantine,Vitreous,ResinousMichael O’Donoghue, Gems, Sixth edition (2006) More from other references |
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Fluorescence & other light emissions |
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Fluorescence (Short Wave UV) | Weak yellowHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Crystallography of Anglesite |
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Crystal System | OrthorhombicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Habit | TabularArthur Thomas, Gemstones (2009) |
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Geological Environment |
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Where found: | Occurs in the oxidized zone of lead deposits.Arthur Thomas, Gemstones (2009) |
Further Information |
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Mineral information: | Anglesite information at mindat.org |
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Significant Gem Localities |
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| Morocco | |
- Touissit-Bou Beker mining district
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 382 | | Namibia | |
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| Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 268, 663. |
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