Tantite

Last updated
Tantite
General
Category Oxide minerals
Formula
(repeating unit)
Ta 2 O 5
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
ColorColorless
Cleavage None
Mohs scale hardness7
Luster Adamantine
Streak White
Diaphaneity Transparent
Specific gravity 8.55
Density 8.45  g/cm3
Optical propertiesBiaxial
References [2] [3]

Tantite is a rare tantalum oxide mineral with formula: Ta 2 O 5. 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

  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi: 10.1180/mgm.2021.43 . S2CID   235729616.
  2. "Tantite mineral information and data". Mindat.org. Retrieved 2011-11-01.
  3. "Tantite Mineral Data". Webmineral.com. Retrieved 2011-11-01.