Olmiite Specimen - SKMF 038

Measurements:  39 x 36 x 27 mm

Description:  Aggregates of brownish / peach coloured olmiite crystals with a small matrix of (?)manganite. At the bottom there is another small piece of (?)manganite, with a piece of calcite on it.

The display side has only a few very small nicks, but the sides are damaged, revealing the interesting structure of the aggregates.

Weight of Specimen:  38.8 g

Chemical Composition:  CaMn[SiO₃(OH)](OH)  (olmiite)
                                       Mn³⁺O(OH)  (manganite)  4 
                                       CaCO₃  (calcite)  3.

Hardness on Mohs Scale:  (olmiite)  5-5.5
                                          (manganite)  4 
                                          (calcite)  3

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

Specimen Code:  SKMF 038