THE PKOPERTIES OF MINERALS. 655 



Arseniosidcrite— FeCa:!(0H)..|As04— Romaiioche, France. (Cat. No. 46376, U.S.N.M.) 



Pharmaeosidciite — Fe^(OH);i(AsO^);;.6H-0 — Mammnth mine, Tiutic, Utah. (Cat. 

 No. 51846, U.S.N.M.) 



Cofiuimbite— (Fe, Al),(SO,):).UHiO— Tierra Amarillo, (_;hile. (Cat. No. 12548, 

 U.S.N.M.) 



Utahitc—Fe;,07lI.-,(FeOII):,(SO,,):!— Eureka mine, Tiutic, Utah. (Cat. No. 48241, 

 U.S.N.M.) 



Wolframite— (Fe, Mn)WO^— Zinnwald, Bohemia. (Cat. No. 12262, U.S.N.M.) 



Copper and its combinations. — Copper is rather abuudautly distributed 

 ill a variety of forms. Combined with sulphur, either alone or with 

 the sulpliur compounds of other elements, it forms a variety of combi- 

 nations, of which chalcocite, Cu^S, and chalcoj)yrite, CuFeS2, are exam- 

 ples. With arsenic and antimony, alone or with other elements, it 

 forms compounds such as doineykite, Cu^As, horsfordite, CugSb, and 

 tetrahedrite, CuiSbjS:. It forms a number of compounds with oxy- 

 gen. These oxygen compounds may be simple oxidation products of 

 copper, like cuprite, Cu^O; or of copper compounds, such as atacamite, 

 Cu,0:,H,Cl; malachite, Cu2(OH)2C03; chrysocolla, H,CuSi04.n205 libe- 

 thenite, Ca.(0H)P04, and chalcanthite, CuSO^.SHaO. 



Examples. 



Chalcocite— CuoS— Cornwall, England. (Cat. No. 16980, U.S.N.M.) 

 Covellite— CuS— Muonta, South Australia. (Cat. No. 83G07, U.S.N.M.) 

 Chalcopyritc — CuFeS- — French Creek, Chester County, Pennsylvania. (Cat. No. 



47i»73, U.S.N.M.) 



Boruite — CusFeS:! — Gilliss mine, Guilford County, North Carolina. (Cat. No. 51603, 



U.S.N.M.) 

 Domeykite — CuyAs — Houghton, Portage Lake, Michigan. (Cat. No. 13377, 



U.S.N.M.) 



Whitneyite — CugAs — Hancock, Portage Lake, Michigan. (Cat. No. 13375,U.S.N.M.) 

 Tetrahedrite — CusSbiS? — Moineberg, Germany. (Cat. No. 49549, U.S.N.M.) 

 Tennantite—CugASiSy— Idaho Springs, Colorado. (Cat. No. 81818, U.S.N.M.) 

 Enargite— Cu;iAsS^— Red Mountain, Colorado. (Cat. No. 81127, U.S.N.M.) - 

 Atacamite— CujO:iH:,Cl—Ataeama, Chile. (Cat. No. 6510, U.S.N.M.) 

 Melaconite — CuO — Leavenworth mine. Central, Colorado. (Cat. No. 13599, 



U.S.N.M.) 

 Cuprite— CUiO — Copper Queen mine, Bisbee, Arizona. (Cat. No. 48780, U.S.N.M.) 

 Malachite — Cu-(OH)jCO:!— Copper (^ueen mine, Bisbee, Arizona. (Cat. No. 48773, 



U.S.N.M.) 

 Azurite — Cu:,(OH):(CO:!): — Detroit mine, ^Nlorenci, Arizona. (Cat. No. 83557, 



U.S.N.M.) 

 Dioptase— HcCuSiOj- Siberia. (Cat. No. 49373, U.S.N.M.) 

 ChrysocoUa — HjCuSiOi.H-O — French Creek, Chester County, Pennsylvania. (Cat. 



No. 46495, U.S.N.M.) 

 Libethenite— Cu.(OH)POj— Libethen, Hungary. (Cat. No. 50966, U.S.N.M.) 

 Torbernite—CuPiO..(UO>)2.8H:0— Cornwall, England. (Cat. No. 16811, U.S.N.M.) 

 Clinoclasite—Cu:j(OII):jA804— Mammoth mine, Tintic, Utah. (Cat. No. 48096, 



U.S.N.M.) 

 01ivenite—Cu;(0H);iAs04— Cornwall, England. (Cat. No. 45332, U.S.N.M.) 

 Conichalcite— (Cii,Ca)j(OH )As04.JH^0— American Eagle mine, Tintic, Utah. (Cat. 



No. 4824.5, U.S.N.M.) 



Erinite— Cu5(0H)iAs..(Xs — Mammoth mine, Tintic, Utah. (Cat. No. 48114, 



U.S.N.M.) 



