Tripuhyite

Tripuhyite
General
Category Antimonate mineral
Formula
(repeating unit)		 FeSbO4
Strunz classification 04.DB.05
Crystal symmetry Tetragonal - ditetragonal dipyramidal
H-M symbol: (4/m 2/m 2/m)
Space group: P 41/mnm
Unit cell a = 4.63 Å, c = 9.14 Å; Z = 2
Identification
Color Yellowish brown, lemon-yellow, brown-black
Crystal habit Fibrous to fine-grained aggregates
Crystal system Tetragonal
Mohs scale hardness 6 - 7
Luster Dull to earthy
Streak Canary-yellow to dark brown with a greenish tinge
Diaphaneity Translucent
Specific gravity 5.82
Optical properties Uniaxial (+)
Refractive index nω = 2.190 nε = 2.330
Birefringence δ = 0.140
Other characteristics Antiferromagnetic
References [1][2][3]

Tripuhyite is an iron antimonate mineral with composition FeSbO4.

Nomenclature

The name of the mineral comes from the localilty of Tripuhy, Ouro Preto, Minas Gerais, Brazil, where it was discovered. Hussak and Prior [4] first described the mineral tripuhyite as an oxide of iron and antimony, and assigned it the composition Fe2Sb2O7. When a mineral with composition FeSbO4 was later discovered in Squaw Creek, New Mexico (USA), it was considered erroneously as a new mineral and it was given the name squawcreekite.[5] However, other studies had shown that the original tripuhyite was also FeSbO4.[6] In 2002, the Commission on New Minerals and Mineral Names (CNMMN) of the International Mineralogical Association (IMA), approved the redefinition of tripuhyite as FeSbO4 and the discreditation of squawcreekite.[7]

References

  1. ↑ Mindat.org
  2. ↑ Handbook of Mineralogy
  3. ↑ Webmineral data
  4. ↑ Hussak, E.; Prior, G. T. (1897). Mineralogical Magazine 11: 302–303. Missing or empty |title= (help)
  5. ↑ Foord, E. E.; P. F. Hlava, J. J. Fitzpatrick, R. C. Erd and R. W. Hinton (1991). Neues Jahrbuch Fur Mineralogie-Monatshefte 8: 363–384. Missing or empty |title= (help)
  6. ↑ Tavora, E. (1955). "X-ray diffraction powder data for some minerals from Brazilian localities". Anais da Academia Brasileira de Ciencias 27: 7–27.
  7. ↑ Berlepsch, P.; T. Armbruster, J. Brugger, A. J. Criddle and S. Graeser (2003). "Tripuhyite, FeSbO4, revisited.". Mineralogical Magazine 67: 31–46. doi:10.1180/0026461036710082.