| General Information |
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| Varieties/Types: | |
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| Chemical Formula | Arthur Thomas, Gemstones (2009) |
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| Physical Properties of Gypsum |
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| Mohs Hardness | 2Arthur Thomas, Gemstones (2009) |
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| Specific Gravity | 2.3Arthur Thomas, Gemstones (2009) |
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| Cleavage Quality | GoodArthur Thomas, Gemstones (2009) |
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| Fracture | UnevenArthur Thomas, Gemstones (2009) |
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| Optical Properties of Gypsum |
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| Refractive Index | 1.52 to 1.53Arthur Thomas, Gemstones (2009) |
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| Optical Character | Biaxial/+Arthur Thomas, Gemstones (2009) |
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| Birefringence | 0.01Arthur Thomas, Gemstones (2009) |
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| Pleochroism | NilArthur Thomas, Gemstones (2009) |
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| Dispersion | NilArthur Thomas, Gemstones (2009) |
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| Colour |
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| Colour (General) | Colourless, grey or white. Less often: brown, red, yellowArthur Thomas, Gemstones (2009) |
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| Transparency | Transparent,TranslucentArthur Thomas, Gemstones (2009) |
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| Lustre | Vitreous,PearlyArthur Thomas, Gemstones (2009) |
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| Crystallography of Gypsum |
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| Crystal System | MonoclinicArthur Thomas, Gemstones (2009) |
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| Habit | TabularArthur Thomas, Gemstones (2009) |
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| Further Information |
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| Mineral information: | Gypsum information at mindat.org |
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