Dolomite

Chocolate brown dolomite with white calcite

Glassy colorless transparent crystals of calcite to 1 cm in size are set nicely about a matrix that is mostly coated by sparkling micro colourless "zincian" dolomite crystals. Minor mottramite in association

Bluish-green "zincian" dolomite

“Cobaltian rich dolomite” matrix, the top hosting a complete coating of sparkling lustrous colourless to very slightly bluish “zincian dolomite” crystals, these averaging 1 – 2 mm in size.

Origin: Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia

Sample size: 11.5 x 5.5 x 7.3 cm (top), 5 x 4 x 5.2 cm (2nd row), 4.2 x 3.7 x 3.3 cm (3rd row), 7 x 8 x 4.5 cm (bottom)

glassy transparent crystals of dolomite to 17 mm in size scattered about a matrix. The brownish red color is due to hematite, both on the matrix and as inclusions within the dolomite crystals.

Origin: Brumado Mine, Brumado, Serra das Eguas, Bahia, Northeast Region, Brazil

Sample size: 6.4 x 4.3 x 2.4 cm