Tripuhyite is an

iron Iron () is a chemical element with Symbol (chemistry), symbol Fe (from la, Wikt:ferrum, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 element, group 8 of the periodic table. It is, Abundanc ...

antimonate mineral Antimonate minerals are those minerals containing the antimonate (SbO43−) anion group. Both the Dana and the Strunz mineral classifications place the antimonates in with the phosphate minerals Phosphate minerals contain the tetrahedrally coord ...

with composition FeSbO₄.

Nomenclature

The name of the mineral comes from the locality of Tripuhy,

Ouro Preto Ouro Preto (, ''Black Gold''), formerly Vila Rica (, ''Rich Village''), is a city in and former capital of the state of Minas Gerais, Brazil, a former colonial mining town located in the Serra do Espinhaço mountains and designated a World Herit ...

, Minas Gerais, Brazil, where it was discovered. Hussak and Prior first described the mineral tripuhyite as an oxide of

and

antimony Antimony is a chemical element with the symbol Sb (from la, stibium) and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient t ...

, 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''. However, other studies had shown that the original tripuhyite was also FeSbO₄. 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.

Crystal Structure

FeSbO₄ exhibits the

rutile Rutile is an oxide mineral composed of titanium dioxide (TiO2), the most common natural form of TiO2. Rarer polymorphs of TiO2 are known, including anatase, akaogiite, and brookite. Rutile has one of the highest refractive indices at visib ...

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

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. Tetragonal minerals Iron(III) minerals Antimony minerals {{Mineral-stub