单词 posnjakite 释义 posnjakite Min.|pznjkat|[ad. Russ. poznyakit (Komkov & Nefedov 1967, in Zap. Vsesoyuz. Min. Obshch. XCVI. 58): see quot. 1967 and -ite1.]A hydrated basic copper sulphate, Cu4(SO4)(OH)6H2O, that occurs as dark blue crystals similar to...