| General Information |
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| Chemical Formula | Anthony et al, Handbook of mineralogy (2001) |
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| Physical Properties of Bertrandite |
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| Mohs Hardness | 6 to 7Anthony et al, Handbook of mineralogy (2001) |
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| Specific Gravity | 2.59 to 2.60Anthony et al, Handbook of mineralogy (2001) |
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| Cleavage Quality | Perfect,DistinctAnthony et al, Handbook of mineralogy (2001) |
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| Optical Properties of Bertrandite |
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| Refractive Index | 1.583 to 1.614Anthony et al, Handbook of mineralogy (2001) |
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| Optical Character | Biaxial/-Anthony et al, Handbook of mineralogy (2001) |
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| Dispersion | WeakAnthony et al, Handbook of mineralogy (2001) |
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| Colour |
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| Colour (General) | Colorless to slightly yellowAnthony et al, Handbook of mineralogy (2001) |
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| Transparency | TransparentAnthony et al, Handbook of mineralogy (2001) |
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| Lustre | Vitreous,PearlyAnthony et al, Handbook of mineralogy (2001) |
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| Crystallography of Bertrandite |
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| Crystal System | OrthorhombicAnthony et al, Handbook of mineralogy (2001) |
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| Habit | Crystals thin tabular, commonly prismatic to needlelike, to 5 cm; in radial aggregates.Anthony et al, Handbook of mineralogy (2001) |
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| Geological Environment |
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| Where found: | In fissures in granites and associated pegmatites and in miarolitic cavities in greisens; commonly an alteration product of beryl, more rarely as a primary mineral.Anthony et al, Handbook of mineralogy (2001) |
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| Further Information |
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| Mineral information: | Bertrandite information at mindat.org |
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