| General Information |
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| Varieties/Types: | Steatite - A massive variety of Talc with a greasy feeling. |
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| Chemical Formula | Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Physical Properties of Talc |
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| Mohs Hardness | 1Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Specific Gravity | 2.20 to 2.80Ulrich 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 Talc |
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| Refractive Index | 1.539 to 1.596Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Optical Character | Biaxial/-Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Birefringence | 0.046 to 0.050Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Colour |
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| Colour (General) | White, greenish, greenish-brown, reddish, yellowishUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Transparency | OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Crystallography of Talc |
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| Crystal System | MonoclinicUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Further Information |
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| Mineral information: | Talc information at mindat.org |
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