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Manganese-iron garnet from Otjosondu, South-West Africa

1952; Volume: 29; Issue: 218 Linguagem: Inglês

10.1180/minmag.1952.029.218.07

2515-821X

F. H. S. Vermaas,

Mineralogy and Gemology Studies

Garnets rich in manganese and iron, associated with bariumfelspars, have been reported by de Villiers from the manganese ores of Otjosondu, South-West Africa, in which they occur as the most abundant silicate mineral. The farm Otjosondu is 80 miles NE. of Okahandja, a railway station on the line between Windhoek and Walvis. One specimen (referred to as no. 1), of which de Villiers published a chemical analysis, is massive and of a somewhat dark-yellowish colour. The material is traversed by veinlets of hyalophane (Cn 9 ), about 0.5 mm. broad.