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| Sarkinite | |
|---|---|
 | |
| General | |
| Category | Arsenate minerals |
| Formula (repeating unit) | Mn2(AsO4)(OH) |
| Strunz classification | 8.BB.15 |
| Dana classification | 41.6.3.3 |
| Crystal system | Monoclinic |
| Unit cell | a=12.7795(13) Å b=13.6127(14) Å c=10.2188(11) Å β = 108.834(2)° Z=16 |
| Identification | |
| Color | Red to yellow |
| Crystal habit | Tabular |
| Cleavage | Distinct on {100} |
| Fracture | Irregular/Uneven, Conchoidal |
| Mohs scale hardness | 4–5 |
| Luster | Greasy |
| Streak | Red to yellow |
| Density | 4.08 to 4.18 g/cm (measured) |
| Optical properties | Biaxial (-) |
| Refractive index | nα=1.793, nβ=1.807, nγ=1.809 |
| Birefringence | δ = 0.016 |
| Pleochroism | Weak |
| 2V angle | 83° (measured) |
| Dispersion | r > v or r < v |
| Absorption spectra | X > Z > Y |
| Solubility | Readily soluble in dilute acids |
Sarkinite, synonymous with chondrarsenite and polyarsenite, is a mineral with formula Mn2(AsO4)(OH). The mineral is named for the Greek word σάρκιυος, meaning flesh, for its red color and greasy luster. The mineral was first noted in Sweden in 1865 as chondrarsenite, though not identified as Sarkinite until 1885.
Description
Sarkinite is red to yellow in color and occurs as thick tabular crystals. Sarkinite is isostructural with triploidite and wolfeite. At its type locality in Sweden, sarkinite has been found in association with barite, bemenite, brandite, calcite, and lead. Sarkinite is a dimorph of eveite and a member of the Wagnerite Group.
History
In 1885, two similar minerals were discovered in Sweden. Polyarsenite was found in Grythyttan and named by Igelström for its high arsenic content. Sarkinite was discovered in Pajsberg, Persberg, and named by A. Sjögren after the Greek word σάρκιυος (for flesh) in reference to the blood-red color and greasy luster. It was considered likely that the two minerals were identical. A study in 1980 showed that polyarsenite and chondrarsenite, discovered in 1865, were in fact sarkinite.
Distribution
As of 2012, sarkinite has been found in Austria, France, Italy, Japan, Kazakhstan, Romania, Sweden, Switzerland, and the United States of America.
- http://onlinelibrary.wiley.com/doi/10.1002/zaac.200570022/abstract
- http://franklin-sterlinghill.com/dunn/ch25/sarkinite.stm
- http://www.springerlink.com/content/kr12m681223h66x2/
References
- ^ "Sarkinite". Mindat. Retrieved May 28, 2012.
- "Sarkinite". Webmineral. Retrieved May 29, 2012.
- Halenius, p. 113.
- Smithsonian Institution (1886). Annual Report of the Board of Regents of the Smithsonian Institution Showing the Operations, Expenditures, and Condition of the Institution to July, 1885 (Report). Government Printing Office. p. 701.
{{cite report}}: Cite has empty unknown parameter:|coauthors=(help) - Dunn, Pete J. (1980). "On the composition of some sarkinites" (PDF). Mineralogical Magazine. 43 (329): 681. Retrieved May 29, 2012.
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Bibliography
- Halenius, Ulf; Westlund, Erika (1998). "Manganese valency and the colour of the Mn2AsO4(OH)polymorphs eveite and sarkinite" (PDF). Mineralogical Magazine. 62 (1): 113–119.
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External links