{{Infobox mineral | name = Hauerite | boxwidth = | boxbgcolor = | image = Hauerite-mun05-64a.jpg | imagesize = 260px | alt = | caption = | category = Sulfide mineral, pyrite group | formula = MnS<sub>2</sub> | IMAsymbol = Hr<ref>{{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}}</ref> | molweight = 119.07 g/mol | strunz = 2.EB.05a | dana = | system = Cubic | class = Diploidal (m{{overline|3}}) <br/>H–M symbol: (2/m {{overline|3}}) | symmetry = ''Pa''{{overline|3}} | unit cell = a = 6.107 Å; Z = 4 | color = Reddish brown or brownish black | colour = | habit = Octahedral crystals and globular aggregates | twinning = | cleavage = {100} Perfect, {010} Perfect, Perfect on {001} | fracture = Uneven to subconchoidal | tenacity = Brittle | mohs = 4 | luster = Metallic-adamantine | streak = Reddish brown | diaphaneity = Opaque to subtranslucent | gravity = 3.463 | density = | polish = | opticalprop = Isotropic | refractive = n = 2.69 | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref name=HBM>{{cite web |last1=Anthony |first1=John W. |last2=Bideaux |first2=Richard A. |last3=Bladh |first3=Kenneth W. |last4=Nichols |first4=Monte C. |title=Hauerite |url=http://www.handbookofmineralogy.org/pdfs/hauerite.pdf |website=Handbook of Mineralogy |publisher=Mineral Data Publishing |access-date=1 August 2022 |date=2005}}</ref><ref name=Webmin>{{Cite web|last1=Barthelmy|first1=David|year=2014|url=http://www.webmineral.com/data/Hauerite.shtml|access-date=1 August 2022|title = Hauerite Mineral Data|website=Webmineral.com}}</ref><ref name=Mindat>{{mindat|id=1831|title=Hauerite|access-date=1 August 2022}}</ref> }}
'''Hauerite''' is a sulfide mineral in the pyrite group. It is the mineral form of Manganese(IV) disulfide {{chem2|MnS2}}. It forms reddish brown or black octahedral crystals with the pyrite structure and it is usually found associated with the sulfides of other transition metals such as rambergite. It occurs in low temperature, sulfur rich environments associated with solfataras and salt deposits in association with native sulfur, realgar, gypsum and calcite.<ref name=HBM/>
It was discovered in Austro-Hungarian Monarchy in Kalinka (now Vígľašská Huta-Kalinka village) sulfur deposit near Detva in what is now Slovakia in 1846 and named after the Austrian geologists, Joseph Ritter von Hauer (1778–1863) and Franz Ritter von Hauer (1822–1899).<ref name=HBM/><ref name=Mindat/>
It is found in Texas, US; the Ural Mountains of Russia, and Sicily, Italy.<ref>{{Cite book |last= |first= |title=Rocks and Minerals |publisher=DK publishers |year=2012 |isbn=978-1-4093-8659-9 |editor-last=Star |editor-first=Fleur}}</ref>
Under high pressure conditions (P>11 GPa), Hauerite undergoes a large collapse in unit cell volume (22%) driven by a spin-state transition.<ref>[http://www.pnas.org/content/111/14/5106.abstract Kimber, S.A.J., et al., ''Giant pressure-induced volume collapse in the pyrite mineral MnS<sub>2</sub>,'' PNAS, April 8, 2014, vol. 111, no. 14, pp. 5106–5110]</ref>
==References== {{Reflist}}
{{Commons}} {{Manganese minerals}}
Category:Manganese minerals Category:Pyrite group Category:Cubic minerals Category:Minerals in space group 205 Category:Minerals described in 1846 Category:Sulfide minerals
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