Mineral Specimen #6131 Sturmanite
N'Chwaning II Mine, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
3.8 x 2.4 x 2.7 cm
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Ca6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12·25H2O
Well formed, barrel shaped Sturmanite crystals with flat hexagonal terminations with beveled edges. The overall color of the crystals is a light, straw yellow. There is some variation in the color towards an orange color on one of the crystals. The terminations are an off white color. The crystals have a good, glossy luster.
Condition: Very Good
Flaws: There is one small crystal which is incomplete.
This mineral is also found in the following galleries: Minerals From Africa | Carbonates | Rare Minerals | Minerals Priced Between 50 and 99 Dollars
