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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 is a mineral with formula Mn2(AsO4)(OH).
Description
Sarkinite is a polymorph of eveite.
History
Distribution
As of 2012, sarkinite has been found in Austria, France, Italy, Japan, Kazakhstan, Romania, Sweden, Switzerland, and the United States of America.
- http://www.minersoc.org/pages/Archive-MM/Volume_62/62-1-113.pdf
- 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.
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