| 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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| 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) |
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| Further Information |
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| Mineral information: | Prasiolite information at mindat.org |
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