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Charlesite : Ca6(Al,Si)2[(OH,O)12|B(OH)4|(SO4)2] · 26H2O, Sturmanite : Ca6(Fe3+,Al,Mn3+)2[(OH)12|B(OH)4|(SO4)2] · 25H2O, Calcite : CaCO3 | |
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N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa Charlesite cores surrounded by sturmanite (they are a series, and portions of the crystal are of different species, thus). These crystals are unusually well-formed to be so rich in charlesite, of which they mostly are composed. Charlesite is more white or very pale yellowish white, while the sturmanite is darker in hue. 4.4 x 2.9 x 1.7 cm |
| © Rob Lavinsky | Photo ID: 112799 View Count: 160 |
Charlesite : Ca6(Al,Si)2[(OH,O)12|B(OH)4|(SO4)2] · 26H2O, Sturmanite : Ca6(Fe3+,Al,Mn3+)2[(OH)12|B(OH)4|(SO4)2] · 25H2O | |
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N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa 4 x 3 x 1.7 cm. Charlesite is a close relative of sturmanite – and this specimen appears to consist of white charlesite crystals with an outer layer of bright yellow sturmanite. The crystals measure to one centimeter. Ex Scott Williams Collection. |
| © Rob Lavinsky | Photo ID: 172051 View Count: 122 |
Charlesite : Ca6(Al,Si)2[(OH,O)12|B(OH)4|(SO4)2] · 26H2O | |
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Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA Termination of charlesite crystal (2 x 2 mm) with clinohedrite (out of view). Illustration from Charles Palache Gossan Minerals E-Book, 2002, by Vandall T. King. |
| © Van King | Photo ID: 203941 View Count: 101 |
Charlesite : Ca6(Al,Si)2[(OH,O)12|B(OH)4|(SO4)2] · 26H2O | |
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Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA Termination of a charlesite wafer crystal with transparent clinohedrite crystals. FOV = 2 x 3 mm. |
| © Van King | Photo ID: 203952 View Count: 56 |
Charlesite : Ca6(Al,Si)2[(OH,O)12|B(OH)4|(SO4)2] · 26H2O | |
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Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA White low angle rhombohedra of charlesite crystals in a stack. FOV = 2 x 3 mm. |
| © Van King | Photo ID: 203954 View Count: 56 |
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Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA Charlesite - 1 mm opaque white flattened hexagonal crystal within 1.5 x 1 x 0.5 cm vuggy red hancockite matrix and associated with yellowish brown andradite. See additional photos. |
| © Christopher O'Neill | Photo ID: 169816 View Count: 159 |
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