Sogdianite
Sogdianite is named after its discovery locality, in Sogdiana, the ancient name of the discovery region in central Asia.
Sogdianite forms transparent to translucent violet crystals.
Sogdianite is a very rare gem, it is highly evaluated for its beautiful colour. Sogdianite has been faceted and cut into cabochons.
Sogdianite forms transparent to translucent violet crystals.
Sogdianite is a very rare gem, it is highly evaluated for its beautiful colour. Sogdianite has been faceted and cut into cabochons.
| General Information | ||||||||||||||||||
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| Chemical Formula |
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| Physical Properties of Sogdianite | ||||||||||||||||||
| Mohs Hardness | 7, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Specific Gravity | 2.77 to 2.90, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Cleavage Quality | Perfect, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Optical Properties of Sogdianite | ||||||||||||||||||
| Refractive Index | 1.606 to 1.608, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Optical Character | Uniaxial/-, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Birefringence | 0.002, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Colour | ||||||||||||||||||
| Colour (General) | Violet, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Transparency | Opaque, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Lustre | Vitreous, Handbook of mineralogy (2001) | |||||||||||||||||
| Fluorescence & other light emissions | ||||||||||||||||||
| Fluorescence (Short Wave UV) | Very dark red, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Fluorescence (Long-Wave UV) | Dark violet, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Crystallography of Sogdianite | ||||||||||||||||||
| Crystal System | Hexagonal, Gemmological Tables (2004) More from other references | |||||||||||||||||
| Habit | Tabular crystals, to 1 cm; in platy aggregates, to 15 cm., Handbook of mineralogy (2001) | |||||||||||||||||
| Geological Environment | ||||||||||||||||||
| Where found: | Occurs in a pegmatite vein with a composition near that of an alkalic granite., Gems, Sixth Edition (2006) | |||||||||||||||||
| Further Information | ||||||||||||||||||
| Mineral information: | Sogdianite information at mindat.org | |||||||||||||||||
| Significant Gem Localities | ||||||||||||||||||
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