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Andradite : Ca3Fe3+2[SiO4]3, Manganite : Mn3+O(OH) | |
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N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Image is 4mm wide. |
| © 2003 D. Schläfli | Photo ID: 14199 View Count: 556 |
Bixbyite : (Mn3+,Fe3+)2O3 | |
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N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa 3.9 x 2.9 x 2.4 cm. This remarkable specimen turned up in a small South African collection and when I showed it to Charlie Key, expert on all things African, his jaw dropped and he said something like "I never thought I'd see another..." He apparently had one from this same pocket, in the early 1980s, and has not had another since. This specimen ... |
| © Rob Lavinsky | Photo ID: 160214 View Count: 190 |
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N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Bultfonteinite sprays. Vasco Trancoso collection and photo. Field: 2cm. |
| © vasco trancoso | Photo ID: 185191 View Count: 64 |
Calcite : CaCO3 | |
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N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa A rare faden calcite formed by a series of flattened crystals. 3cm X 1.5cm X 6cm |
| © Geoffrey Krasnov | Photo ID: 88782 View Count: 125 |
Calcite (Var: Manganoan Calcite) : (Ca,Mn)CO3 | |
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N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Aggregations of hundreds of tiny modified scalenohedrons form spherical clusters on host rock. 8cm X 5cm X 3cm |
| © Geoffrey Krasnov | Photo ID: 89007 View Count: 128 |
Ettringite : Ca6Al2[(OH)4|SO4]3 · 26H2O, Calcite : CaCO3 | |
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N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Ettringite crystals to about 8mm long, showing colour zoning from greenish-yellow mid zones to yellowish-brown terminations; on crust of mm-sized calcite crystals. (f.o.v. ~25 x 20 mm) Photo by Pete Nancarrow; Olympus C-1400 XL digital (+ macro extension lens), overcast daylight. Pete Nancarrow collection, purchased specimen, collector unknown. ... |
| © Pete Nancarrow | Photo ID: 8157 View Count: 651 |
Ettringite : Ca6Al2[(OH)4|SO4]3 · 26H2O | |
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N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Photo & specimen J.Ralph. |
| Photo ID: 88 View Count: 621 | |
Ettringite : Ca6Al2[(OH)4|SO4]3 · 26H2O | |
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N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Cluster of many intersecting whitish, doubly-terminated hexagonal ettringite crystals up to 8 mm long in matrix. Ex. A. Stevenson collection #763. Overall size of mineral specimen: 15x13x11 mm. Size of individual crystals: 1-8 mm. |
| © 2001 John H. Betts | Photo ID: 1154 View Count: 476 |
Ettringite : Ca6Al2[(OH)4|SO4]3 · 26H2O | |
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N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Large single crystal of whitish ettringite 20 mm long. The termination is flat with corner modifications. The back side has black manganese inclusions where the matrix was. Ex. A. Stevenson collection #764. Overall size of mineral specimen: 23x14x12 mm. Size of individual crystals: 20 mm. |
| © 2001 John H. Betts | Photo ID: 1155 View Count: 466 |
Ettringite : Ca6Al2[(OH)4|SO4]3 · 26H2O | |
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N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Large single crystal of whitish ettringite 20 mm long. The termination is a shallow pyramidal shape and is complete and undamaged. Ex. A. Stevenson collection #765. Overall size of mineral specimen: 23x15x13 mm. Size of individual crystals: 23 mm. |
| © 2001 John H. Betts | Photo ID: 1403 View Count: 415 |
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