metals. 84. .Cuprum. 
259 
3a. cuprum. Fine red eafily tarnifhing ^ 
air, hard and tenacious, malleable and duaile, 
fonorous and elaftic, fpecific gravity 8,667 : 
melting with difficulty, and when expofed to a 
red heat taking fire and emitting a moft brilliant 
green light i exploding violently when melted 
and cafi into water : ioluble in moft acids and 
ammonia, exhibiting a blue colour ; from its 
folution in nitric acid precipitating a blue oxyde 
by the addition of petals : tinging glafs green. 
Copper. 
Cncombined. 
Cupram nudum, xii. 3. US* 
Cuprum nativum. Wull.fsfl. ^ p- Z74* “• •• 
Native copper. Kh-xvan miner. Z. 
Na ive copper. Schmei£'er mineral. 2. p. 1 20. 
Native copper. Thom/on chem. 4. p. 37- 
Z. Precipitated by a vitripiic folution. _ 
Cuprura prxeipitatum. Sfft. nat. xii. 3. p. ,178. «. 3. 
Precipitated copper. Kirnuan miner. 2 . p, 128, 
3. Cryftalliied in 8-fided figures. 
Cuprum cryftaUifatum. Syit. nat. TiW. I- p.'\\l. n. p,. 
Gmel.M- J; t- ^2- 
Sonverby Brit miner, tab. 17. 25. 
Found in Cornivall, Anglefia. Wicklonu in Ireland, O" (bores 
of the Capper ijland near Kamtfchatka, in Iceland and the teroe 
i/Iand’, Hungary, Siberia, Snveden, Noravay, and many parts 
of the old and new world i in compaft maffes, plates, threads, 
and arborefcetvt and botryoidal figures of various forms; 
fometimes cr\.ftallizcd in cubes or double 4-fvded pyramids: 
texture fomet mes granulated, rarely lamellar; fuperficiai 
colour when tarnilhed greenilh-yellow, op reddifh with a. 
oale ereen, bluilh or variegated ; when hard and compad it 
takes a fine polifli, and exhibits a rich metallic luftre, but 
foon tarnilhes by the adion of the air and contraas a green- 
i(h rult called verdegris : fpecific gravity from 7,600 to 
8,667. 
h 
‘‘eteritium. 
Red, foft, without metallic luftre. 
Ochra cupri. Sy/t. nat. Xii. 3 - P- «• ^ 
Cuprum corrofum. Ifall. fylh /■ 290. ». 16. 
Earty red ore. Kirwan mineral. 2 . p. 135. 
K k 2 
