EXTRA-LIMITAL SPECIES. 449 



CHRYSOCOLLA. 

 Copper Green. Cleaveland. 



Colour emerald and pistachio-green, passing into blue ; brownish when impure. Massive, 

 stalactitic, in crusts, etc. Semi-transparent to opaque. Hardness 2.0 to 3.0. Sp. gr. 2.00 

 to 2.20. Changes colour, but is infusible before the blowpipe. Composed of oxide of copper 

 45.17, silica 37.25, water 17,00. 



At the Bridgewater copper mine near Somerville, N. Jersey ; and at other deposits of 

 copper ores in the same State. Also on Lake Superior. 



COLUxMBITE. 



Ferruginous Oxide of Columbium. Cleaveland. — Tantalite. Allan. 



Colour black. In crystals or crystalline masses. Primary a right rectangular prism. Lustre 

 shining. Opaque. Hardness 6.0. Sp. gr. G.OO to 6.30. Infusible before the blowpipe. 

 Composed of columbic acid 67.60, oxide of tin 8.70, oxide of iron 7.60, oxide of manga- 

 nese 5.90, lungslic acid 8.70, lime 1.50. 



Haddam, Chesterfield and Beverly in Massachusetts ; Middletown in Connecticut ; and 

 Acworth, New-Hampshire. 



COPPER NICKEL. 

 Arsenical Nickel. Cleaveland. 



Colour copper-red. Massive; very rarely crystalHzed. Lustre shining and metallic. Hard- 

 ness 5.0 to 5.5. Sp. gr. 6.60 to 7.70. Melts before the blowpipe, and gives out an arse- 

 nical vapour. Composed of nickel 44.21, arsenic 54.73, with a little lead, iron and sulphur. 



Chatham, Connecticut, with smaltine. 



CORNEOUS LEAD. 

 Carbonated Muriate of Lead. Cleaveland. 



Colour white, greyish or yellow. Crystallized. Primary a right rectangular prism. Lustre 

 adamantine. Hardness less than 3.0. Sp. gr. 6.06. Melts before the blowpipe into a yel- 

 low globule, which becomes white on cooling. Composed of oxide of lead, with variable 

 proportions of carbonic and muriatic acids. 



Southampton, Massachusetts, accompanying galena. 



MiN. — Part II. .57 



