Tripuhyite

Tripuhyite
General
Category	Antimonate mineral
Formula; (repeating unit)	FeSbO4
Strunz classification	4.DB.05
Crystal system	Tetragonal
Crystal class	Ditetragonal dipyramidal (4/mmm) ; H-M symbol: (4/m 2/m 2/m)
Space group	P41/mnm
Unit cell	a = 4.63, c = 9.14 [Å]; Z = 2
Identification
Color	Yellowish brown, lemon-yellow, brown-black
Crystal habit	Fibrous to fine-grained aggregates
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 (+), canary-yellow color (transmitted light)
Refractive index	nω = 2.190 nε = 2.330
Birefringence	δ = 0.140
Pleochroism	None
Solubility	Insoluble in acids
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 locality 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 (US), 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]

Crystal Structure

FeSbO₄ exhibits the rutile structure, with a tetragonal unit cell. The cations are octahedrally coordinated to oxygen anions, with the octahedra sharing edges along the c-direction. Fe(III) and Sb(V) cations are distributed in a disordered way over the octahedral sites.

References

Mindat.org
Handbook of Mineralogy
Webmineral data
Hussak, E.; Prior, G. T. (1897). "On Tripuhyite, a New Antimonate of Iron, from Tripuhy, Brazil". Mineralogical Magazine. 11: 302–303. doi:10.1180/minmag.1897.011.53.04.
Foord, E. E.; P. F. Hlava; J. J. Fitzpatrick; R. C. Erd; R. W. Hinton (1991). Neues Jahrbuch für Mineralogie - Monatshefte. 8: 363–384. Missing or empty |title= (help)
Tavora, E. (1955). "X-ray diffraction powder data for some minerals from Brazilian localities". Anais da Academia Brasileira de Ciências. 27: 7–27.
Berlepsch, P.; T. Armbruster; J. Brugger; A. J. Criddle; S. Graeser (2003). "Tripuhyite, FeSbO₄, revisited". Mineralogical Magazine. 67: 31–46. doi:10.1180/0026461036710082.

Bibliography

Palache, P.; Berman H.; Frondel, C. (1960). "Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)" John Wiley and Sons, Inc., New York, pp. 1024.

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[Mindat-1] Mindat.org

[HBM-2] Handbook of Mineralogy

[Webmin-3] Webmineral data

[4] Hussak, E.; Prior, G. T. (1897). "On Tripuhyite, a New Antimonate of Iron, from Tripuhy, Brazil". Mineralogical Magazine. 11: 302–303. doi:10.1180/minmag.1897.011.53.04.

[5] Foord, E. E.; P. F. Hlava; J. J. Fitzpatrick; R. C. Erd; R. W. Hinton (1991). Neues Jahrbuch für 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 Ciências. 27: 7–27.

[7] Berlepsch, P.; T. Armbruster; J. Brugger; A. J. Criddle; S. Graeser (2003). "Tripuhyite, FeSbO₄, revisited". Mineralogical Magazine. 67: 31–46. doi:10.1180/0026461036710082.