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620 CHLORIDES WITH OXIDES AND CARBONATES. copper, or a mixture of copper and lead. On charcoal in the inner flame with soda yielda metallic globules, which dissolve without residue in dilute nitric acid. With borax in the outer flame melts into a transparent blueish-green bead, which in the inner flame becomes turbid and brownish-red. By boiling in nitric acid becomes white and then dissolves. The analysis by Dr. Percy of a very small unknown quantity, separated from the matrix by boiling in nitric acid, gave :— chlorine 0'84, lead 2'66, copper 0'77 : whence Dr. Percy con cludes the composition of the mineral to be represented by the formula Pbci + Pb + CuCi + Cu + xii. In minute crystals, accompanied by gold, on a matrix of quartz and earthy hematite, said to have come from La Sonora in Mexico. CHLORIDE WITH SULPHATE. 453. CONNELLITE.—Sulphato-chloride of copper; Con nell. Connellite; Dana. Ehombohedral. pick 035. a oil, b 211. . oa' ab I Lustre vitreous v In the matrass yields a little water. Decrepitates when heated, imparts a fine greenish-blue to the flame, and melts before the blowpipe into a dark reddish globule. Completely soluble in nitric and in hydrochloric acid. Insoluble in water. Consists, according to Connell, of chloride of copper, sulphate of oxide of copper, and a little water. Was found in small fibrous crystals, with an arseniate of oxide of copper, in Cornwall. CHLORIDES WITH OXIDES AND CARBONATES. 454. MATLOCKITE.—Matlockite; E. P. Greg. Philoso phical Magazine. August, 1851. Pyramidal. 101,001 = eo° 26’. c 001, e 101, m no, r 111. 60° O' 30 0 Translucent. Blue.
