| General Information |
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| Chemical Formula | | (Mg,Fe | | ) | | [(Mg,Fe | | ) | | Al | | ](Si | | Al | | )O | | (OH) | | |
Anthony et al, Handbook of mineralogy (2001) |
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| Physical Properties of Gedrite |
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| Mohs Hardness | 5.5 to 6Anthony et al, Handbook of mineralogy (2001) |
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| Specific Gravity | 3.15 to 3.259Anthony et al, Handbook of mineralogy (2001) |
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| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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| Cleavage Quality | Perfect,ImperfectAnthony et al, Handbook of mineralogy (2001) |
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| Optical Properties of Gedrite |
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| Refractive Index | 1.625 to 1.718Anthony et al, Handbook of mineralogy (2001) |
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| Optical Character | Biaxial/+Anthony et al, Handbook of mineralogy (2001) |
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| Pleochroism | Weak to moderate, in browns, yellows, or gray.Anthony et al, Handbook of mineralogy (2001) |
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| Colour |
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| Colour (General) | White, gray, brown, green; colorless, gray, or brown in thin section.Anthony et al, Handbook of mineralogy (2001) |
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| Transparency | Transparent,TranslucentAnthony et al, Handbook of mineralogy (2001) |
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| Lustre | VitreousAnthony et al, Handbook of mineralogy (2001) |
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| Crystallography of Gedrite |
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| Crystal System | OrthorhombicAnthony et al, Handbook of mineralogy (2001) |
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| Habit | As bladed and prismatic crystals; fibrous and semi-sheaflike aggregates.Anthony et al, Handbook of mineralogy (2001) |
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| Geological Environment |
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| Where found: | Widespread in medium- to high-grade metamorphic rocks; in metasomatized contact metamorphic rocks.Anthony et al, Handbook of mineralogy (2001) |
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| Further Information |
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| Mineral information: | Gedrite information at mindat.org |
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