Summary. Two nickel arsenates from South Terras mine, St. Stephen-in~Branne]l, Cornwall, have been shown to be identical with the minerals xanthiosite and aerugite, described by C. Bergemann in 1858, and with two synthetic products described by J. B. Taylor and R. D. Heyding (1958). Xanthiosite is pure golden- Early references to a tin-lode and an 'iron-lode' contain scant detail, and omit mention of the associated minerals actinolite, axinite, and garnet, with magnetite in the 'iron-lode', which is a metamorphic deposit in greenstone rather than a true lode. Mining of the iron deposit revealed in 1873 an intersection with a uranium lode, which was later developed as one of the main Cornish uranium deposits until it was exhausted about 35 years ago.The mineralization of this uranium lode, in common with that of other similar low-temperature Cornish cross-courses, is of the nickelcobalt-arsenic-bismuth-silver-uranium type. Some parts of the lode were rich in arsenopyrite and 1511ingite with smaller amounts of nickel and cobalt arsenides and accessory chalcopyrite, chaleocite, pyrite, and a little galena. This is the first record of 1511ingite at South Tetras, and
SummaryFour new occurrences of vanadium minerals are described. New X-ray powder data are given for descloizite and mottramite, and show appreciable differences. Evidence is brought that the original occurrence of mottramite was not at Mottram St. Andrew, Cheshire, but Pim Hill, Shropshire, and that most if not all specimens labelled Mottram St. Andrew or Cheshire really came from Pim Hill.
Lindgrenite, a basic copper molybdate Cu3(MoO4)2(OH)2, was first described in 1935 by Palache from the oxidized zone of the great copper deposit at Chuquicamata, province of Antofagasta, Chile. A second occurrence has been recently described from the Helena mine in the Seven Devils mining district, Adams Co., Idaho, the first recorded in the U.S.A. In this paper we are able to record a third occurrence; this time in Cumberland, adding another species to the list of British minerals.
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