Tripuhyite

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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[edit]

The name of the mineral comes from the localilty of Tripuhy, 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[edit]

  1. ^ Mindat.org
  2. ^ Handbook of Mineralogy
  3. ^ Webmineral data
  4. ^ Hussak, E.; Prior, G. T. (1897). Mineralogical Magazine 11: 302–303. 
  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. 
  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.