Olmiite and Calcite on ManganiteSKMF 030

Large olmiite ball on manganite matrix with gemmy calcite crystals

Measurements:  70 x 65 x 48 mm

Description:  A large olmiite ball (31 mm wide) sits perched on a manganite matrix with small (up to about 2 mm long) gemmy, clear  calcite crystals, that gives a sparkle to the specimen.

The olmiite ball has a rich, dark peach / camel colour and has a vein of manganese running through it.

There is a contact mark of 12 mm diameter to the front side of the ball. 

Weight of Specimen:   305 g

Chemical Composition:  CaMn[SiO3(OH)](OH)  (olmiite) 
                                      CaCO3  (calcite

Hardness on Mohs Scale:  (olmiite)  5-5.5

Location:  N'Chwaning 2, Kalahari Manganese Fields, Kuruman area, South Africa.

Specimen Code:  SKMF 030

US $ 230

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