Bruce mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
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Located close to the Sishen mine.
Mn minerals are found within Wolhaarkop chert breccia. They are found in the upper portion of the breccia among, i.a., void-fills. The outer part of the fills consists of norrishite, followed by serandite + albite + feldspar + granular sugilite. The cores of some vugs have armbrusterite and/or fibrous sugilite. There are also unzoned assemblages of similar mineralogy, but with minor kentrolite, strontianite and witherite. Dating of fibrous sugilite yields the age of 620.2 ± 3.3 Ma, thus younger for the Kalahari Manganese Fields assemblages.
12 entries listed. 11 valid minerals.
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- John M. Moore, Barbara K. Kuhn, Darren F. Mark, and Harilaos Tsikos (2011): A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating. European Journal of Mineralogy 23, 661-673.