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From Wikipedia, the free encyclopedia
Tantite is a rare tantalum oxide mineral with formula: Ta2O5. Tantite forms transparent microscopic colorless triclinic - pedial crystals with an adamantine luster. It has a Mohs hardness of 7 and a high specific gravity of 8.45. Chemical analyses show minor inclusion (1.3%) of niobium oxide.
Tantite | |
---|---|
General | |
Category | Oxide minerals |
Formula (repeating unit) | Ta2O5 |
IMA symbol | Tan[1] |
Strunz classification | 4.EA.05 |
Dana classification | 04.06.06.01 |
Crystal system | Triclinic |
Crystal class | Pedial (1) (same H-M symbol) |
Space group | P1 |
Unit cell | a = 3.8 Å, b = 3.79 Å c = 35.74 Å; β = 90.18°; Z = 6 |
Identification | |
Formula mass | 441.89 g/mol |
Color | Colorless |
Cleavage | None |
Mohs scale hardness | 7 |
Luster | Adamantine |
Streak | White |
Diaphaneity | Transparent |
Specific gravity | 8.55 |
Density | 8.45 g/cm3 |
Optical properties | Biaxial |
References | [2][3] |
It was first described in 1983 for an occurrence in a pegmatite in the Kola peninsula, Russia. It has also been reported from a pegmatite complex in Florence County, Wisconsin. Associated mineral species include elbaite, lepidolite, spodumene, columbite-tantalite, wodginite, and microlite.
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