Sogdianite
| Refractive Index : 1608 – 1.606 |
| Optical Characteristic : DR, U- |
| Specific Gravity : 2.90 – 2.76 |
| Formula : (K,Na)2Li,Fe,AI,Ti)2Zr2(Si2O5)6 |
| Crystal System : Hexagonal |
| Variety/Species : sogdianite |
| Species/Group : Osumilite group |
| Birefringence : 0.002 |
| Dispersion : |
| Hardness : 5 to 7 |
| Toughness : poor |
| Ultrasonic : Never |
| Steam : Never |
| UV Long : Inert to weak |
| UV Short : Inert to weak |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : sensitive |
| Acids : sensitive |
| Light : stable |
| Polish Luster : vitreous to waxy |
| Fracture : conchoidal |
| Fracture Luster : |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : |
| Enhancements : none |
| Cleavage : perfect 1 direction. |
| Color Range : violet, (bright) violetish |
| Transparency : opaque |
| Phenomena : None |
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| Separations : Sogdianite from- Sugilite : spectrum (possibly) |
| Identifying Characteristics and information Extremely rare. Usually mixed with other minarals so RI and SG are variable. May require chemical analysis to separate from sugilite. |
| Spectral Data Sharp lines at 4110, 4190 and 4370 (diagnostic). weak bands at 4880-4930 and 6300-6450. |
| Trade Names and Misnomers Sogdianite |
Tags: Osumilite group, sogdianite
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