| General Information |
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| Chemical Formula | Anthony et al, Handbook of mineralogy (2001) |
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| Physical Properties of Franklinite |
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| Mohs Hardness | 6Anthony et al, Handbook of mineralogy (2001) |
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| Specific Gravity | 5.05 to 5.22Anthony et al, Handbook of mineralogy (2001) |
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| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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| Cleavage Quality | FairAnthony et al, Handbook of mineralogy (2001) |
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| Fracture | Uneven,Sub-ConchoidalAnthony et al, Handbook of mineralogy (2001) |
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| Optical Properties of Franklinite |
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| Optical Character | IsotropicAnthony et al, Handbook of mineralogy (2001) |
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| Colour |
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| Colour (General) | Iron-black, brown, red, may be tarnished; in reflected light, white to gray, with dark red internal reflectionsAnthony et al, Handbook of mineralogy (2001) |
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| Transparency | Translucent,OpaqueAnthony et al, Handbook of mineralogy (2001) |
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| Lustre | Dull (Earthy),Metallic,SubmetallicAnthony et al, Handbook of mineralogy (2001) |
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| Crystallography of Franklinite |
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| Crystal System | IsometricAnthony et al, Handbook of mineralogy (2001) |
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| Habit | Typically as octahedra, commonly with rounded edges, to 22 cm. Also exsolved within other minerals; coarse to fine granular, massive.Anthony et al, Handbook of mineralogy (2001) |
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| Geological Environment |
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| Where found: | In beds and veins formed by high temperature metamorphism of Fe, Zn, Mn rich marine carbonate sediments. As a minor mineral in some manganese and iron deposits.Anthony et al, Handbook of mineralogy (2001) |
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| Further Information |
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| Mineral information: | Franklinite information at mindat.org |
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