Hauerite

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Hauerite
Hauerite-mun05-64a.jpg
General
Category Sulfide mineral, pyrite group
Formula MnS2
IMA symbol Hr [1]
Strunz classification 2.EB.05a
Crystal system Cubic
Crystal class Diploidal (m3)
H–M symbol: (2/m 3)
Space group Pa3
Unit cell a = 6.107 Å; Z = 4
Identification
Formula mass 119.07 g/mol
ColorReddish brown or brownish black
Crystal habit Octahedral crystals and globular aggregates
Cleavage {100} Perfect, {010} Perfect, Perfect on {001}
Fracture Uneven to subconchoidal
Tenacity Brittle
Mohs scale hardness4
Luster Metallic-adamantine
Streak Reddish brown
Diaphaneity Opaque to subtranslucent
Specific gravity 3.463
Optical propertiesIsotropic
Refractive index n = 2.69
References [2] [3] [4]

Hauerite is a sulfide mineral in the pyrite group. It is the mineral form of Manganese(IV) disulfide 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. [2]

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). [2] [4]

It is found in Texas, US; the Ural Mountains of Russia, and Sicily, Italy. [5]

Under high pressure conditions (P>11 GPa), Hauerite undergoes a large collapse in unit cell volume (22%) driven by a spin-state transition. [6]

References

  1. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi: 10.1180/mgm.2021.43 . S2CID   235729616.
  2. 1 2 3 Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Hauerite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved 1 August 2022.
  3. ↑ Barthelmy, David (2014). "Hauerite Mineral Data". Webmineral.com. Retrieved 1 August 2022.
  4. 1 2 "Hauerite". Mindat.org . Retrieved 1 August 2022.
  5. ↑ Star, Fleur, ed. (2012). Rocks and Minerals. DK publishers. ISBN   978-1-4093-8659-9.
  6. ↑ Kimber, S.A.J., et al., Giant pressure-induced volume collapse in the pyrite mineral MnS2, PNAS, April 8, 2014, vol. 111, no. 14, pp. 5106–5110
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