Kutnohorite
Image: <a href="//commons.wikimedia.org/wiki/User:Archaeodontosaurus" title="User:Archaeodontosaurus">Didier Descouens</a> (CC BY-SA 4.0)
Mineral NameKutnohorite
Chemical FormulaCa(Mn,Mg,Fe)(CO3)2
Mohs Hardness3.5
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavageperfect on {1011}
Fractureuneven
Specific Gravity3.2
Colorsdark brown, blackish, white, pink, light brown
Transparencytranslucent
Type LocalityLevane, Bucine, Valdarno (Val d'Arno), Province of Arezzo, Tuscany, Italy
Mineral GroupCarbonates
Usescollector
Associated Mineralsaragonite
Rarityuncommon
Description
The image displays a dark, granular mass of kutnohorite, which is surrounded by radiating clusters of clear to white acicular aragonite crystals.
Geological Context
Kutnohorite is a manganese-rich carbonate mineral that forms in metamorphic or hydrothermal deposits, often in association with other manganese-bearing minerals.
