General Information |
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A variety or type of: | 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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Photos of natural/un-cut material from mindat.org |
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Prasiolite Treatments |
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Color produced by heat-treatment and irradiation of light amethyst: may fade with long exposure to sunlight - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7 |
Physical Properties of Prasiolite |
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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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Light Sensitivity | May fade with long exposure to sunlight.Walter Schumann, Gemstones of the world (2001) |
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Optical Properties of Prasiolite |
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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 | Very weak: light green - pale greenWalter Schumann, Gemstones of the world (2001) |
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Dispersion | 0.013Walter Schumann, Gemstones of the world (2001) |
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Colour |
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Colour (General) | Leek-greenWalter Schumann, Gemstones of the world (2001) More from other references |
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Causes of Colour | Green, Fe2+.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) | NoneWalter Schumann, Gemstones of the world (2001) |
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Crystallography of Prasiolite |
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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: | Prasiolite information at mindat.org |
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