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Posnjakite with Brochantite - Drakewalls Mine, Drakewalls, Calstock, Cornwall, England, UK
(#:MINS8355)
Blue posnjakite associated with green brochantite on an iron stained killas matrix.Uncommon material from the Drakewalls Mine in Cornwall.This mine and the Waterbank Mine in Staffordshire are really the only two localities of note for Posnjakite in England.Ex
Francesco Bedognè
coll. #987. - Ex
Albert Leo "Al" McGuinness
coll. - year 1978
Formula :
Cu
4
[(OH)
6
/SO
4
] * H
2
O
System:
monoclinic
Hardness:
2-3
Rarity:
rare
Strunz id:VI/D.3-10 - SULFATES, CHROMATES, MOLYBDATES and TUNGSTATES
Name origin:
Named in 1967 by A. I. Komkov and E. I. Nefedov in honour of Eugene Waldemar Posnjak (23 June 1888, Moscow, Russia - 31 July 1949, Santa Barbara, California), U.S. geochemist at the Geophysical Laboratory, Washington, U.S.A., who investigated the system CuO-SO3-H2O.
Specimen weight:15 gr.
Crystal size:mm. 1
Overall size: 42mm x 30 mm x 10 mm
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