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Calcite (variety manganoan calcite)
N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa
70 mm x 55 mm x 47 mm
(Author: Don Lum)
| Dimensions: | 1600 x 1250 |
| File size: | 217.75 kbytes |
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