| General Information |
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| Chemical Formula | | Na | | [Fe | | (Al,Fe | | )]Al | | (BO | | ) | | Si | | O | | (OH) | | |
Anthony et al, Handbook of mineralogy (2001) |
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| Physical Properties of Foitite |
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| Mohs Hardness | 7Anthony et al, Handbook of mineralogy (2001) |
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| Specific Gravity | 3.17Anthony et al, Handbook of mineralogy (2001) |
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| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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| Fracture | IrregularAnthony et al, Handbook of mineralogy (2001) |
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| Optical Properties of Foitite |
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| Optical Character | Uniaxial/-Anthony et al, Handbook of mineralogy (2001) |
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| Pleochroism | Strong: pale lavender - dark blueAnthony et al, Handbook of mineralogy (2001) |
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| Colour |
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| Colour (General) | Bluish blackAnthony et al, Handbook of mineralogy (2001) |
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| Transparency | 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 Foitite |
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| Crystal System | HexagonalAnthony et al, Handbook of mineralogy (2001) |
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| Habit | Crystals prismatic, elongated and striated, with triangular cross section, to 5.5 cmAnthony et al, Handbook of mineralogy (2001) |
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| Geological Environment |
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| Where found: | Probably in granite pegmatites.Anthony et al, Handbook of mineralogy (2001) |
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| Further Information |
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| Mineral information: | Foitite information at mindat.org |
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