Mineral: Sapphirine
Locality: Madagascar
Dimensions: main crystal: 8 cm

Description: Mass: 345 g MIM number:2272 Set of 13 floating, very well formed, gray-black crystals, with masses ranging from 4 to 118 grams, the largest measuring 8 cm, which is considered large for this species. 4 crystals are not twinned, and are formed of superimposed hexagonal poker chips, with traces of anorthite on some. 7 crystals show a perfect oblique twin, and 2 crystals show a right-angle twin. Photographer: AINU / Augustin de Valence

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