Chemistry:Hauerite

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Hauerite
Hauerite-mun05-64a.jpg
General
CategorySulfide mineral, pyrite group
Formula
(repeating unit)
MnS2
Strunz classification2.EB.05a
Crystal systemCubic
Crystal classDiploidal (m3)
H–M Symbol: (2/m 3)
Space groupPa3
Unit cella = 6.107 Å; Z = 4
Identification
Formula mass119.07 g/mol
ColorReddish brown or brownish black
Crystal habitOctahedral crystals and globular aggregates
Cleavage{100} Perfect, {010} Perfect, Perfect on {001}
FractureUneven to subconchoidal
TenacityBrittle
Mohs scale hardness4
|re|er}}Metallic-adamantine
StreakReddish brown
DiaphaneityOpaque to subtranslucent
Specific gravity3.463
Optical propertiesIsotropic
Refractive indexn = 2.69
References[1][2][3]

Hauerite is a manganese sulfide mineral with the chemical formula 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.[1]

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).[1][3]

Under high pressure conditions (P>11 GPa), Hauerite undergoes a large collapse in unit cell volume (22 %) driven by a spin-state transition.[4]

References