Prasiolite
Prasiolite Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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Prasiolite Gemstones by Size
This table shows distribution of Prasiolite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:1.10 cts
Heaviest:24.09 cts
Average:10.91 cts
Total photos:41
Do you have a larger Prasiolite? Why not upload a photo?
| General Information | ||||||
|---|---|---|---|---|---|---|
| A variety or type of: | Quartz | |||||
| Other Names/Trade Names: | ||||||
| Chemical Formula |
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| Photos of natural/un-cut material from mindat.org | ||||||
| Prasiolite Treatments | ||||||
| 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 | ||||||
| Mohs Hardness | 7, Blue Chart Gem Identification (2010) | |||||
| Specific Gravity | 2.65, Gemmological Tables (2004) | |||||
| Tenacity | Brittle, Gemstones of the world (2001) Very brittle | |||||
| Cleavage Quality | None, Gemstones of the world (2001) | |||||
| Fracture | Conchoidal, Gemstones of the world (2001) | |||||
| Light Sensitivity | May fade with long exposure to sunlight., Gemstones of the world (2001) | |||||
| Optical Properties of Prasiolite | ||||||
| Refractive Index | 1.544 to 1.553, Blue Chart Gem Identification (2010) | |||||
| Optical Character | Uniaxial/+, Gemmological Tables (2004) | |||||
| Birefringence | 0.009, Gemmological Tables (2004) | |||||
| Pleochroism | Very weak: light green - pale green, Gemstones of the world (2001) | |||||
| Dispersion | 0.013, Gemstones of the world (2001) | |||||
| Colour | ||||||
| Colour (General) | Leek-green, Gemstones of the world (2001) More from other references | |||||
| Causes of Colour | Green, Fe2+., Pragmatic Spectroscopy For Gemologists (2011) | |||||
| Transparency | Transparent,Translucent,Opaque, Gemmological Tables (2004) | |||||
| Fluorescence & other light emissions | ||||||
| Fluorescence (General) | None, Gemstones of the world (2001) | |||||
| Crystallography of Prasiolite | ||||||
| Crystal System | Trigonal, Gemmological Tables (2004) | |||||
| Habit | Hexagonal prisms, Gemstones of the world (2001) | |||||
| Further Information | ||||||
| Mineral information: | Prasiolite information at mindat.org | |||||