CALCUTTA MADRAS KARACHI IBADAN NAIROBI DAR ES SALAAM CAPE TOWN Published in the USA by Oxford University...colourless, monoclinic crystals from Kimberley, South Africa. Named after Mr. Alpheus Fuller Williams, of... p. 399; Zeits. Kryst. Min., vol. xlvi, p. 513. Lead meta-silicate, PbSi03, occurring as snow-white,...group. Named from the locality, Aldan region, eastern Siberia (18th List). [M.A., 12, 460.] 20th List...Occurs as thin veins in kimberlite from the ‘Lucky Eastern’ pipe, presumably in Yakutia, and has the composition |