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Measurements: 48 x 26 x 29 mm Description: Botryoidal, pearly blue,
semi-transparent chalcedony with pieces of calcite from a recent find
at N'Chwaning
mine. The only notable damage to this interesting-looking specimen, is
to its
bottom, where it parted from the matrix. Weight of Specimen: 24 g Chemical
Composition:
SiO2
Hardness
on
Mohs Scale: 6.5
- 7
Location: N'Chwaning
3, Kalahari Manganese Fields, Kuruman area, Specimen Code: SKMF 010
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