| General Information |
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| Chemical Formula | Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Physical Properties of Thaumasite |
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| Mohs Hardness | 3.5Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Specific Gravity | 1.90Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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| Cleavage Quality | PoorAnthony et al, Handbook of mineralogy (2001) |
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| Fracture | Sub-ConchoidalAnthony et al, Handbook of mineralogy (2001) |
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| Optical Properties of Thaumasite |
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| Refractive Index | 1.467 to 1.505Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Optical Character | Uniaxial/-Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Birefringence | 0.038Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Colour |
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| Colour (General) | ColourlessUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Transparency | TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Lustre | Vitreous,Silky,Greasy,Dull (Earthy)Anthony et al, Handbook of mineralogy (2001) |
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| Crystallography of Thaumasite |
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| Crystal System | HexagonalUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Habit | Acicular prismatic crystals or compact massesMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Geological Environment |
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| Where found: | Occurs as a very late-stage mineral in some sulphide ore deposits.Michael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Further Information |
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| Mineral information: | Thaumasite information at mindat.org |
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| Significant Gem Localities |
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| South Africa | | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 459 |
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