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| boxwidth =
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| image =
| 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>
| strunz = 02.EB.05a▼
| molweight = 119.07 g/mol▼
| dana =
| system = [[Cubic crystal system|Cubic]]▼
| symmetry = Isometric [[H–M Symbol]] (2/m{{overline|3}}) diploidal▼
| class = Diploidal (m{{overline|3}}) <br/>[[H–M symbol]]: (2/m {{overline|3}})
| unit cell = a = 6.107 Å; Z = 4▼
▲| molweight = 119.07
| color = Reddish brown or brownish black
| colour =
| habit = Octahedral crystals and globular aggregates
▲| system = [[Cubic crystal system|Cubic]]
| twinning =
| cleavage = {100} Perfect, {010} Perfect, Perfect on {001}
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| references = <ref name=HBM>
}}
'''Hauerite''' is a [[manganese]] [[sulfide]] mineral with the [[chemical formula]] [[manganese|Mn]][[sulfur|S]]<sub>2</sub>. It forms reddish brown or black octahedral [[crystal]]s 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 [[solfatara]]s and salt deposits in association with [[native sulfur]], [[realgar]], [[gypsum]] and [[calcite]].<ref name=HBM/>
It was discovered in [[
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==
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[[Category:Pyrite group]]
[[Category:Cubic minerals]]
[[Category:Minerals in space group 205]]
[[Category:Minerals described in 1846]]
{{sulfide-mineral-stub}}
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