Botryoidal, Velvety Blue Chalcedony on ManganiteSKMF 017


Layer of botryoidal, velvety blue chalcedony on matrix of manganese



Measurements:  49 x 30 x 25 mm

Description:   A layer of botryoidal, velvety blue chalcedony on a matrix of manganese.  The white mineral could possibly be calcite.  The only damage is to the edges of the specimen.

Weight of Specimen:  34.4 g

Chemical Composition:  SiO2   (chalcedony)
                                   
Mn3+O(OH)  (manganite)

Hardnesson Mohs Scale:  (chalcedony)  6.5 to 7
                                     (manganite)  
4

Location:  N'Chwaning 3, Kalahari Manganese Fields, Northern Cape, South Africa.

Specimen Code:  SKMF 017

US $ 75





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