136 DESCRIPTIONS OF MINERALS. 



stein some gold. Specimens from Schwatz, and some other 

 localities, contain 15 to 18 per cent, of mercury, and are 

 called Spaniolite. A kind containing 9 to 13 per cent, of 

 lead and 10 to 13 of silver, has been called Mai inoivs kite. 



Obs. The Cornish mines, Andreasberg in the Hartz, 

 Kremnitz in Hungary, Freiberg in Saxony, Kapnik in Tran- 

 sylvania, and Dillenberg in Nassau, afford fine crystalliza- 

 tions of this ore. It is a common ore in the Chilian mines, 

 and it is worked there and elsewhere for copper and often 

 also for silver. Occurs also in Mexico ; in Mariposa and 

 Shasta counties, Cal. ; abundantly at the Sheba and De Soto 

 mines, Humboldt Co.; Nevada, near Austin in Lander Co. ; 

 in the San Juan region, Colorado ; at the Heintzelman 

 Mine, and the Santa Rita Mine, in Arizona ; also in fine 

 crystallizations in the caves of Huallanca, on the Peruvian 

 Andes, at a height of about 14,700 feet, an ore yielding 

 much silver. 



Bournonite. Contains Sulphur 29 - 6, antimony 25*0, lead 4224, cop- 

 per 18*0 — 100. Its crystals are modified rectangular prisms, of a steel- 

 gray color and streak, and are often compounded into shapes like a 

 cog-wheel, whence it is called wheel-ore. H. =2*5-3. Gr. =5 - 766. 

 From the Tyrol, Hartz, Transylvania, Saxony, Cornwall, and Siberia. 



Other sulphantimonites or sulpharsenites of copper are Chalcostibite, 

 Emplectite, Binnite, Stylotypite, Aikinite, Enaryite, Polybasite. Poly- 

 basite contains also silver. 



Atacamite. — Copper Osichloride. 



Trimetric ; in rhombic prisms and other forms ; also 

 granular massive. Color green to blackish green. Lustre 

 adamantine to vitreous. Streak apple-green. Translucent 

 to subtranslucent. H. = 3-3-5. G. = 3-75-3-9. Com- 

 position, Cu Clo + 3 Cu 2 H,= Chlorine 16*64, oxygen 11-25, 

 copper 11-25, water 12-66 = 100. From the Atacama desert, 

 between Chili and Peru, and elewhere in Chili ; also from 

 Bolivia, Vesuvius, Saxony, Spain, Cornwall. 



Cuprite. — Red Copper Ore. 



Isometric. In regular octahedrons, and modified forms of 

 the same. Cleavage octahedral. Also massive, and some- 

 times earthy. 



Color deep red, of various shades. Streak brownish red. 

 Lustre adamantine or submetallic ; also earthy. Subtrans- 

 parent to nearly opaque. Brittle. H. — 3*5-4. G. =5*85- 

 6-15. 



