sarkinite

{{Infobox mineral

| name = Sarkinite

| boxwidth =

| boxbgcolor =

| image = Sarkinite-MD-18492a.jpg

| imagesize = 260px

| caption =

| formula = Mn₂(AsO₄)(OH){{cite web|title=Sarkinite|url=http://www.mindat.org/min-3535.html|publisher=Mindat|access-date=May 28, 2012}}

| IMAsymbol = Srk{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

| molweight =

| 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{{cite web|title=Sarkinite|url=http://webmineral.com/data/Sarkinite.shtml|publisher=Webmineral|access-date=May 29, 2012}} or granular

| twinning =

| cleavage = Distinct on {100}

| fracture = Irregular/Uneven, Conchoidal

| tenacity =

| mohs = 4–5

| luster = Greasy

| polish =

| refractive = n_α=1.793, n_β=1.807, n_γ=1.809

| opticalprop = Biaxial (−)

| birefringence = δ = 0.016

| 2V = 83° (measured)

| dispersion = r > v or r < v

| pleochroism = Weak

| fluorescence=

| absorption = X > Z > Y

| streak = Red to yellow

| gravity =

| density = 4.08 to 4.18 g/cm³ (measured)

| melt =

| fusibility =

| diagnostic =

| solubility = Readily soluble in dilute acids

| diaphaneity = Semitransparent{{cite web|title=Sarkinite|url=http://www.handbookofmineralogy.org/pdfs/sarkinite.pdf|work=Handbook of Mineralogy|publisher=Mineral Data Publishing|access-date=May 30, 2012}}

| other =

| references =

}}

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 and is a dimorph of eveite.Halenius, p. 113. The crystal structure consists of MnO₄(OH)₂ octahedra, MnO₄(OH) trigonal bipyramids, and AsO₄ tetrahedra.Dal Negro, p. 246.

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.{{Cite report |author=Smithsonian Institution |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=https://books.google.com/books?id=WLYAAAAAYAAJ&pg=PA701 |publisher=Government Printing Office |page=701 }} A study in 1980 showed that polyarsenite and chondrarsenite, discovered in 1865, were in fact both sarkinite.{{cite journal|last=Dunn|first=Pete J.|title=On the composition of some sarkinites|journal=Mineralogical Magazine|date=March 1980|volume=43|issue=329|url=http://rruff.geo.arizona.edu/doclib/MinMag/Volume_43/43-329-681.pdf|access-date=May 29, 2012|page=681|doi=10.1180/minmag.1980.043.329.22|bibcode=1980MinM...43..681D|s2cid=129159875 }}

Distribution

{{As of|2012}}, 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=

{{cite journal|last1=Halenius|first1=Ulf|last2=Westlund|first2=Erika|title=Manganese valency and the colour of the Mn2AsO4(OH) polymorphs eveite and sarkinite|journal=Mineralogical Magazine|date=February 1998|volume=62|issue=1|pages=113–119|url=http://www.minersoc.org/pages/Archive-MM/Volume_62/62-1-113.pdf|doi=10.1180/002646198547503|bibcode=1998MinM...62..113H|s2cid=95357747}}
{{cite journal|last1=Dal Negro|first1=A.|last2=Giuseppetti|first2=G.|last3=Pozas|first3=J. M. Martin|title=The crystal structure of sarkinite, Mn2AsO4(OH)|journal=Mineralogy and Petrology|year=1974|volume=21|issue=3–4|pages=246–260|doi=10.1007/BF01081034|bibcode = 1974MinPe..21..246D }}

External links

Category:Manganese(II) minerals

Category:Arsenate minerals

Category:Monoclinic minerals

Category:Minerals in space group 10