| General Information |
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| Chemical Formula | | (K,Na) | | (Li,Fe) | | (Zr,Ti,Fe)Si | | O | | |
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Physical Properties of Sogdianite |
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| Mohs Hardness | 7Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Specific Gravity | 2.77 to 2.90Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Cleavage Quality | PerfectUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Optical Properties of Sogdianite |
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| Refractive Index | 1.606 to 1.608Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Optical Character | Uniaxial/-Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Birefringence | 0.002Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Colour |
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| Colour (General) | VioletUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Transparency | OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Lustre | VitreousAnthony et al, Handbook of mineralogy (2001) |
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| Fluorescence & other light emissions |
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| Fluorescence (Short Wave UV) | Fluoresces very dark redAnthony et al, Handbook of mineralogy (2001) |
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| Fluorescence (Long-Wave UV) | Fluoresces dark violetAnthony et al, Handbook of mineralogy (2001) |
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| Crystallography of Sogdianite |
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| Crystal System | HexagonalUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Habit | Tabular crystals, to 1 cm; in platy aggregates, to 15 cm.Anthony et al, Handbook of mineralogy (2001) |
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| Geological Environment |
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| Where found: | In a pegmatite vein with a composition about that of an alkalic granite.Anthony et al, Handbook of mineralogy (2001) |
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| Further Information |
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| Mineral information: | Sogdianite information at mindat.org |
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