kutnohorite

{{Infobox mineral | name = Kutnohorite | category = Carbonate mineral | boxwidth = 24 | boxbgcolor = #ffc0cb | image = Kutnohorite-120661.jpg | caption = Kutnohorite, Wessels Mine, Kalahari manganese fields, Northern Cape Province, South Africa. Size 4.4 x 4.2 x 1.9 cm | formula = | IMAsymbol = Kut | unit cell = 330.60 ų| molweight = 215.0 g/mol (end member) | strunz = 5.AB.10 | dana = 14.2.1.3 | system = Trigonal | class = Rhombohedral () H-M symbol: () | symmetry = R | color = White, pale pink or light brown | habit = Aggregates of bundled bladed crystals | cleavage = Perfect on {101} | fracture = Subconchoidal | tenacity = Brittle | mohs = 3.5–4 | luster = Vitreous to dull | refractive = no = 1.710–1.727,ne = 1.519–1.535 | opticalprop = Uniaxial (−) | birefringence = 0.191–0.192 | streak = White to pale pink | gravity = 3.12 | density = 3.10–3.12 | solubility = Soluble in acids | diaphaneity = Translucent | references = }}

Kutnohorite is a rare calcium manganese carbonate mineral with the formula in the dolomite group of minerals. It forms a solid solution with the other group members dolomite and ankerite. The mineral was originally spelt "kutnahorite" but "kutnohorite" is the current IMA-approved spelling.