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Sarkinite

Mineral

Field	Value
name	Sarkinite
category	Arsenate minerals
image	Sarkinit-24468.JPG
imagesize	260px
formula	Mn2(AsO4)(OH)
IMAsymbol	Srk
strunz	8.BB.15
dana	41.6.3.3
system	Monoclinic
class	Prismatic (2/m)
(same H-M symbol)
symmetry	P2m
unit cell	a = 12.7795(13) Å
b = 13.6127(14) Å
c = 10.2188(11) Å
β = 108.834(2)°; Z = 16
color	Red to yellow
habit	Tabular or granular
cleavage	Distinct on {100}
fracture	Irregular/Uneven, Conchoidal
mohs	4–5
luster	Greasy
refractive	nα=1.793, nβ=1.807, nγ=1.809
opticalprop	Biaxial (−)
birefringence	δ = 0.016
2V	83° (measured)
dispersion	r v or r
pleochroism	Weak
absorption	X Z Y
streak	Red to yellow
density	4.08 to 4.18 g/cm3 (measured)
solubility	Readily soluble in dilute acids
diaphaneity	Semitransparent

(same H-M symbol) b = 13.6127(14) Å c = 10.2188(11) Å β = 108.834(2)°; Z = 16 Sarkinite, synonymous with chondrarsenite and polyarsenite, is a mineral with formula Mn2(AsO4)(OH). The mineral is named for the Greek word σάρκιυος, meaning made of 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. 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, metamorphosed zinc ore bodies, and rarely in metamorphosed Fe–Mn ore bodies.

Structure

Sarkinite is isostructural with triploidite and wolfeite 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

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

Association

Sarkinite has been found in association with:

Harstigen mine, Sweden

Barite, bementite, brandtite, calcite, lead

Sjö mine, Sweden

Jacobsite, katoptrite, magnetite, tephroite

Ködnitz Valley, Austria

Pyroxmangite, rhodochrosite, rhodonite, spessartine, tephroite, tiragalloite

Falotta mine, Switzerland

Brandtite, braunite, grischunite, manganoan berzeliite, rhodochrosite, tilasite

Sterling Hill, New Jersey, US

Adamite, allactite, barite, brandtite, copper, euchroite, eveite, kraisslite, manganese oxides, parabrandtite, rhodochrosite, serpierite, willemite

References

Bibliography

References

"Sarkinite". Mindat.
Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
"Sarkinite". Webmineral.
"Sarkinite". Mineral Data Publishing.
and is a [[Polymorphism (materials science)
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". [[United States Government Publishing Office.
Dunn, Pete J.. (March 1980). "On the composition of some sarkinites". Mineralogical Magazine.

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