EXTRA-LIMITAL SPECIES. 449 



CHRYSOCOLLA. 



Coiijior Green. Clcarduml. 



Colour emerald and pistachio-green, passing into liluc ; 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. Cliangcs colour, but is infusible before the blowpipe. Composed of oxide of copper 

 45.17, silica 37.25, water 17.00. 



At the Bridgcwater copper mine near Soracrvillc, N. Jersey ; and at other deposits of 

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



COLUMBITE. 



Ferruginous Oxklc of Coluiiihium. Chanhmi'. — Tanlulile. Allan. 



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

 shining. Opaque. Hardness 0.0. Sp. gr. G.OO to t).30. Infusible belore the blowpipe. 

 Composed of columbic acid 67.60, oxide of tin S.70, oxide of iron 7.60, oxide of manga- 

 nese 5.i)0, tungstic acid 8.70, lime 1 .50. 



Haddam, Cliesterlield and Beverly in Massachusetts ; Middleiown in Connecticut ; and 

 Acworth, New-Hampshire. 



COPPER NICKEL. 



Arscnieal Nielcel. Ckavclanit . 



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

 ness 5.0 to 5.5, Sp. gr. 0.(')0 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 LeaJ. Cknvdiiuil. 



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

 adamantine. Hardness less than 3.0. Sp. gr. 6. 00. i\[ells before the blowjiipe into a yel- 

 low globule, which becomes while on cooling. Composed of oxide of leail, with variablc 

 proportions of carbonic and muriatic acids. 



Southampton, Massachusetts, accompanying galena. 



MiN. — PartH. 57 



