Tantite

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Tantite
General
CategoryOxide minerals
Formula
(repeating unit)
Ta2O5
Strunz classification4.EA.05
Dana classification04.06.06.01
Crystal systemTriclinic
Crystal classPedial (1)
(same H-M symbol)
Space groupP1
Unit cella = 3.8 Å, b = 3.79 Å
c = 35.74 Å; β = 90.18°; Z = 6
Identification
Formula mass441.89 g/mol
ColorColorless
CleavageNone
Mohs scale hardness7
LusterAdamantine
StreakWhite
DiaphaneityTransparent
Specific gravity8.55
Density8.45 g/cm3
Optical propertiesBiaxial
References[1][2]

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.

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.

References[edit]

  1. ^ "Tantite mineral information and data". Mindat.org. Retrieved 2011-11-01.
  2. ^ "Tantite Mineral Data". Webmineral.com. Retrieved 2011-11-01.