- Breithauptite
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Breithauptite 
Breithauptite on calcite from the Samson Mine, St Andreasberg, Harz Mountains, Lower Saxony, Germany (Field of view 17 mm)General Category Antimonide mineral Chemical formula NiSb Strunz classification 02.CC.05 Crystal symmetry Hexagonal dihexagonal dipyramidal
H-M symbol: (6/m 2/m 2/m)
Space group: P 63/mmcUnit cell a = 3.946 Å, c = 5.148 Å, Z=2 Identification Color Pale copper-red, may be with violet tint Crystal habit Crystals rare, thin tabular or needlelike, to 1 mm; arborescent, disseminated, massive Crystal system Hexagonal Twinning Twin plane {1011} Cleavage None Fracture Subconchoidal to uneven Tenacity Brittle Mohs scale hardness 5.5 Luster Metallic Streak Reddish brown Diaphaneity Opaque Specific gravity 7.591–8.23 measured; 8.629 calculated Pleochroism Very distinct References [1][2][3] Breithauptite is a nickel antimonide mineral with the simple formula NiSb. Breithauptite is a metallic opaque copper-red mineral crystallizing in the hexagonal - dihexagonal dipyramidal crystal system. It is typically massive to reniform in habit, but is observed as tabular crystals. It has a Mohs hardness of 3.5 to 4 and a specific gravity of 8.23.
It occurs in hydrothermal calcite veins associated with cobalt–nickel–silver ores.
It was first described in 1840 from the Harz Mountains, Lower Saxony, Germany and in 1845 for occurrences in the Cobalt and Thunder Bay districts of Ontario, Canada. It was named to honor Saxon mineralogist Johann Friedrich August Breithaupt (1791–1873).
References
- Palache, C., H. Berman, and C. Frondel (1944) Dana’s system of mineralogy, (7th edition), v. I, pp. 238–239
Massive breithauptite with orange-brown nickeline and minor quartz from the Cobalt area of Ontario, Canada (9.3 x 4.9 x 3.0 cm)
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