General Information |
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A variety or type of: | Quartz |
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Varieties/Types: | Morion - Sometimes synonymous with Smoky quartz, but often reserved for nearly black Smoky quartz. |
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Other Names/Trade Names: | |
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Chemical Formula | Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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Smoky Quartz Treatments |
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May be produced by irradiation of rock crystal (not detectable with standard tests) - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7 |
Physical Properties of Smoky Quartz |
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Mohs Hardness | 7Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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Specific Gravity | 2.65Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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Tenacity | BrittleWalter Schumann, Gemstones of the world (2001) |
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Cleavage Quality | NoneWalter Schumann, Gemstones of the world (2001) |
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Fracture | ConchoidalWalter Schumann, Gemstones of the world (2001) |
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Optical Properties of Smoky Quartz |
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Refractive Index | 1.544 to 1.553Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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Optical Character | Uniaxial/+Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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Birefringence | 0.009Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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Pleochroism | Dark: definite - brown, reddish-brownWalter Schumann, Gemstones of the world (2001) More from other references |
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Dispersion | 0.013Walter Schumann, Gemstones of the world (2001) |
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Colour |
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Colour (General) | Clear brown colour and varying from a light brown to dark a brownMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Causes of Colour | Smokey, color center related to the Al3+ impurity.W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) |
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Transparency | Transparent,Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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Fluorescence & other light emissions |
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Fluorescence (General) | Usually noneWalter Schumann, Gemstones of the world (2001) |
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Crystallography of Smoky Quartz |
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Crystal System | TrigonalUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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Habit | Hexagonal prismsWalter Schumann, Gemstones of the world (2001) |
Further Information |
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Mineral information: | Smoky Quartz information at mindat.org |
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Significant Gem Localities |
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| Bolivia | |
| Laurs (2001, 2010) |
| Laurs (2001, 2010) | | Brazil | |
| Macri et al. (2006) |
| Macri et al. (2006) | | Kenya | |
| | | Madagascar | |
| Madagascar, extraLapis English No.1, 2001, p. 46 |
| Pezzotta (2001) |
| Madagascar, extraLapis English No.1, 2001, p. 43 |
| Danet (2009) |
| | | Mozambique | |
| Bettencourt-Dias and Wilson (2000) | | Myanmar | |
| Ted Themelis (2008) Gems & mines of Mogok |
| Ted Themelis (2008) Gems & mines of Mogok | | Sri Lanka | |
| | | UK | |
| No reference listed | | USA | |
- Warner Springs Mining District
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