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	'''Sarkinite''', synonymous with '''chondrarsenite''' and '''polyarsenite''', is a mineral with formula Mn<sub>2</sub>(AsO<sub>4</sub>)(OH). The mineral is named for the ] word σάρκιυος, meaning ''made of flesh'', for its red color and greasy ]. The mineral was first noted in Sweden in 1865 as chondrarsenite, though not identified as Sarkinite until 1885.		'''Sarkinite''', synonymous with '''chondrarsenite''' and '''polyarsenite''', is a mineral with formula Mn<sub>2</sub>(AsO<sub>4</sub>)(OH). The mineral is named for the ] word ''σάρκιυος'', meaning made of flesh, for its red color and greasy ]. The mineral was first noted in Sweden in 1865 as chondrarsenite, though not identified as Sarkinite until 1885.

	==Description==		==Description==
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	==History==		==History==
	In 1885, two similar minerals were discovered in Sweden. Polyarsenite was found in ] and named by Igelström for its high arsenic content. Sarkinite was discovered in Pajsberg, ], and named by A. Sjögren after the Greek word σάρκιυος ~~(for~~ ''made of flesh~~'')~~ in reference to the blood-red color and greasy luster. It was considered likely that the two minerals were identical.<ref>{{Cite report \|author=Smithsonian Institution \|authorlink= \|coauthors= \|year=1886 \|title=Annual Report of the Board of Regents of the Smithsonian Institution Showing the Operations, Expenditures, and Condition of the Institution to July, 1885 \|url=http://books.google.com/books?id=WLYAAAAAYAAJ \|publisher=] \|page=701 \|docket= \|accessdate= \|quote= }}</ref> A study in 1980 showed that polyarsenite and chondrarsenite, discovered in 1865, were in fact sarkinite.<ref>{{cite journal\|last=Dunn\|first=Pete J.\|title=On the composition of some sarkinites\|journal=Mineralogical Magazine\|year=1980\|month=March\|volume=43\|issue=329\|url=http://rruff.geo.arizona.edu/doclib/MinMag/Volume_43/43-329-681.pdf\|accessdate=May 29, 2012\|page=681}}</ref>		In 1885, two similar minerals were discovered in Sweden. Polyarsenite was found in ] and named by Igelström for its high arsenic content. Sarkinite was discovered in Pajsberg, ], and named by A. Sjögren after the Greek word ''σάρκιυος'', meaning made of flesh, in reference to the blood-red color and greasy luster. It was considered likely that the two minerals were identical.<ref>{{Cite report \|author=Smithsonian Institution \|authorlink= \|coauthors= \|year=1886 \|title=Annual Report of the Board of Regents of the Smithsonian Institution Showing the Operations, Expenditures, and Condition of the Institution to July, 1885 \|url=http://books.google.com/books?id=WLYAAAAAYAAJ&pg=PA701 \|publisher=] \|page=701 \|docket= \|accessdate= \|quote= }}</ref> A study in 1980 showed that polyarsenite and chondrarsenite, discovered in 1865, were in fact both sarkinite.<ref>{{cite journal\|last=Dunn\|first=Pete J.\|title=On the composition of some sarkinites\|journal=Mineralogical Magazine\|year=1980\|month=March\|volume=43\|issue=329\|url=http://rruff.geo.arizona.edu/doclib/MinMag/Volume_43/43-329-681.pdf\|accessdate=May 29, 2012\|page=681}}</ref>

	==Distribution==		==Distribution==

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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
Space group	Space group: P2₁/a
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 or granular
Cleavage	Distinct on {100}
Fracture	Irregular/Uneven, Conchoidal
Mohs scale hardness	4–5
Luster	Greasy
Streak	Red to yellow
Diaphaneity	Semitransparent
Density	4.08 to 4.18 g/cm (measured)
Optical properties	Biaxial (-)
Refractive index	n_α=1.793, n_β=1.807, n_γ=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

Description

Sarkinite is red to yellow in color. It occurs as thick tabular crystals, short prismatic crystals, or has a granular habit. Sarkinite sometimes aggregates into a roughly spherical shape. Sarkinite is a member of the Wagnerite Group.

The mineral occurs in manganese-rich lenses in quartzitic chlorite schists, methamorphosed zinc ore bodies, and rarely in metamorphosed Fe–Mn orebodies.

Structure

Sarkinite is isostructural with triploidite and wolfeite and is a dimorph of eveite. The crystal structure consists of MnO₄(OH)₂ octahedra, MnO₄(OH) trigonal bipyramids, and AsO₄ tetrahedra.

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, meaning made of 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 both sarkinite.

Distribution

As of 2012, sarkinite has been found in Austria, France, Italy, Japan, Kazakhstan, Romania, Sweden, Switzerland, and the United States of America.

Association

Sarkinite has been found in association with:

Harstigen mine, Sweden

Sjö mine, Sweden

Ködnitz Valley, Austria

Falotta mine, Switzerland

Sterling Hill, New Jersey, USA

References

^ "Sarkinite". Mindat. Retrieved May 28, 2012.
^ "Sarkinite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved May 30, 2012.
"Sarkinite". Webmineral. Retrieved May 29, 2012.
Halenius, p. 113.
Dal Negro, p. 246.
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. {{cite journal}}: Unknown parameter |month= ignored (help)

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. {{cite journal}}: Unknown parameter |month= ignored (help)
Dal Negro, A.; Giuseppetti, G.; Pozas, J. M. Martin (1974). "The crystal structure of sarkinite, Mn2AsO4(OH)". Mineralogy and Petrology. 21 (3–4): 246–260. doi:10.1007/BF01081034.