Riemvasmaak fluorite occurrences, Riemvasmaak, Kakamas, ZF Mgcawu District, Northern Cape Province, South Africa
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|Location is approximate, estimate based on other nearby localities.|
|Latitude & Longitude (WGS84):||27° South , 21° East (est.)|
|Margin of Error:||~1km|
|Other regions containing this locality:||Kalahari Desert, Africa|
|Köppen climate type:||BWh : Hot deserts climate|
The location is given as 3 km north of the village of Riemvasmaak.
Excellent vibrant green fluorite, partly covered with thin sugary quartz crusts appeared on the market in 2004 although specimens are known from the region from the 1970s (Johannesburg Geology Museum collection). Yellow, yellow-green, purple, pale green and colourless phantom crystals have also been found.
The quartz crusts only coats the fluorite whereas the associated matrix and quartz crystals remain uncoated, the crusts are usually (partly) dissolved with HF before they come on the market.
The cause of the beautiful green colour is unknown, it may be related to associated radioactive or rare-earth species, samples where tested and yielded surprising results; isotopes in the rare-earth element lanthanide series; lanthanum, ytterbium, cerium, neodymium, samarium, europium, gadolinium and holmium were detected although amounts were not determined.
4 valid minerals.
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Cairncross, B. (2007): Mineral news from Southern Africa. Australian Journal of Mineralogy 13, 47-49.
Cairncross, B. (2009): Fluorite from Riemvasmaak, Northern Cape Province, South Africa. Mineralogical Record 40:4 307-324.
Miller, D. (2010): Die Fluorite von Riemvasmaak, Südafrika - ein Besuch vor Ort. Lapis 35 (4), 38-44; 54.