Locality type: | Mine |
Classification |
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Species: | Sewardite |
Formula: | CaFe23+(AsO4)2(OH)2 |
Comments: | occurs as platy to compact anhedral to subhedral masses that do not exceed 0.3 mm in maximum size and are randomly scattered throughout the dark green to black matrix. Sewardite is easily confused with the more common carminite; chemical analysis is required to distinguish the two minerals |
Abundance at site: | Very Rare |
Confirmation |
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Validity: | Valid - Type Locality |
Data |
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Mineral Data: | Click here to view Sewardite data |
Locality Data: | Click here to view Tsumeb Mine (Ongopolo Mine), Tsumeb, Oshikoto Region, Namibia |
Data Identifiers |
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Mindat Occurrence Record ID: | 100349 |
Long-form Identifier: | 1:3:100349:9 |
GUID (UUID V4): | 8eff547a-ce3f-41a4-a8b7-c04778ae39f2 |
References |
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Roberts, A. C., Cooper, M. A., Hawthorne, F. C., Criddle, A. J., Stirling, J. A.R. (2002) Sewardite, CaFe3+2(AsO4)2(OH)2, the Ca-analogue of carminite, from Tsumeb, Namibia: description and crystal structure. The Canadian Mineralogist, 40 (4) 1191-1198 doi:10.2113/gscanmin.40.4.1191 |
Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia