Jump to content

Tripuhyite

From Wikipedia, the free encyclopedia
(Redirected from Iron antimonate)
Tripuhyite
Tripuhyite from the Tafone Mine, Grosseto Province, Tuscany, Italy
General
CategoryAntimonate mineral
Formula
(repeating unit)
FeSbO4
IMA symbolTpy[1]
Strunz classification4.DB.05
Crystal systemTetragonal
Crystal classDitetragonal dipyramidal (4/mmm)
H-M symbol: (4/m 2/m 2/m)
Space groupP41/mnm
Unit cella = 4.63, c = 9.14 [Å]; Z = 2
Identification
ColorYellowish brown, lemon-yellow, brown-black
Crystal habitFibrous to fine-grained aggregates
Mohs scale hardness6 - 7
LusterDull to earthy
StreakCanary-yellow to dark brown with a greenish tinge
DiaphaneityTranslucent
Specific gravity5.82
Optical propertiesUniaxial (+), canary-yellow color (transmitted light)
Refractive indexnω = 2.190 nε = 2.330
Birefringenceδ = 0.140
PleochroismNone
SolubilityInsoluble in acids
Other characteristicsAntiferromagnetic
References[2][3][4]

Tripuhyite is an iron antimonate mineral with composition FeSbO4.

Nomenclature

[edit]

The name of the mineral comes from the locality of Tripuhy, Ouro Preto, Minas Gerais, Brazil, where it was discovered. Hussak and Prior[5] 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.[6] However, other studies had shown that the original tripuhyite was also FeSbO4.[7] 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.[8]

Crystal Structure

[edit]

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

[edit]
  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. ^ Mindat.org
  3. ^ Handbook of Mineralogy
  4. ^ Webmineral data
  5. ^ Hussak, E.; Prior, G. T. (1897). "On Tripuhyite, a New Antimonate of Iron, from Tripuhy, Brazil". Mineralogical Magazine. 11 (53): 302–303. Bibcode:1897MinM...11..302H. doi:10.1180/minmag.1897.011.53.04.
  6. ^ Foord, E. E.; P. F. Hlava; J. J. Fitzpatrick; R. C. Erd; R. W. Hinton (1991). Neues Jahrbuch für Mineralogie - Monatshefte. 8: 363–384. {{cite journal}}: Missing or empty |title= (help)
  7. ^ Tavora, E. (1955). "X-ray diffraction powder data for some minerals from Brazilian localities". Anais da Academia Brasileira de Ciências. 27: 7–27.
  8. ^ Berlepsch, P.; T. Armbruster; J. Brugger; A. J. Criddle; S. Graeser (2003). "Tripuhyite, FeSbO4, revisited". Mineralogical Magazine. 67 (1): 31–46. Bibcode:2003MinM...67...31B. doi:10.1180/0026461036710082. S2CID 54551345.

Bibliography

[edit]
  • 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.