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2023-09-28 19:49 altermaven  
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Kutnohrite is a rare calcium manganese carbonate mineral with extra magnesium and iron. It is part of the dolomite subgroup. Often seen as bright red or pinkish, this has a comparable refractive index similar to spinel, yet denser than standard dolomite. however, it is brittle.  
  
The mohs hardness of kutnohrite is between 3.5-4.