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Connellite

1911 Encyclopedia Britannica

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a rare mineral species, a hydrous copper chloro-sulphate, Cu 15 (C1,OH) 4 S0 16 1511 2 O, crystallizing in the hexagonal system. It occurs as tufts of very delicate acicular crystals of a fine blue colour, and is associated with other copper minerals of secondary origin, such as cuprite and malachite. Its occurrence in Cornwall was noted by Philip Rashleigh in 1802, and it was first examined chemically by Arthur Connell in 1847. Outside Cornwall it has been found only in Namaqualand in South Africa.