MANGANOAN KUTNOHORITE WITH CALCITE N'Chwaning II Mine , South Africa Let me say it is a "delicious" copy manganoan kutnohorita with calcite. This rare member of dolomite, a calcium carbonate with manganese, magnesium and some iron .
Green jade is a sacred stone of Asia. Malachite grows in layers of tiny crystals. Its colors correlate with different crystal sizes: small crystals form light green bands and larger crystals make darker ones.