THE PROPERTIES OF MINERALS. 653 



miuiiim, rb304; or of lead compounds, such as auglesite, PbSO^; 

 melanotekite, Pb^FeoSi^O,,, and cerussite, PbCOs. With chlorine it 

 forms cotunuite, PbCl.; with chlorine and oxygen or oxygen salts it 

 forms oxychlorides and other salts of a mixed composition, such as 

 chlorocarbonates and chloroarseuates. 



Examples. 



( Jaleua— rbS— Mine La Motte, Missouri. (Cat. No. 45140, U.S.N.M. ) 

 Altaite— PbTe— Cold Spring luiue, Gold Hill, Colorado. i^Cat. No. 1.3509, U.S.N.M.) 

 .lamcsonite—Pb.Sb.S,,— Cornwall, England. (Cat. No. 12501, U.S.N.M.) 

 Freieslebeuite— (Pb,Ag-)6Sl)4Sn — Garfield mine, Guunisou County, Colorado. (Cat. 



No. 82U21', U.S.N.M.) 

 Cotunuite— PbCl..— Vesuvius, Italy. (Cat. No. 1361ti, U.S.N.M.) 

 Plattueriti — PbO:— " You Like " mine, Mullau, Idaho. (Cat. No. 48G04, U.S.N.M.) 

 Cerussite — PbCOa — County Yaucowiuna, New South Wales. (Cat. No. 82480, 



U.S.N.M.) 

 Melanotekite— PbjFe.SlA'—Paisberg, Sweden. (Cat. No. 83544, U.S.N.M. ) 

 Harysilite — PbsSieOr — Harstig mine, Paisberg, Sweden. (Cat. No. 48y70, U.S.N.M.) 

 Vanadiuite— (PbCl)Pb^( V04):,— Yuma County, Arizona. (Cat. No. 48793, U.S.N.M.) 

 Endlichite— (PbCl)Pb,((A8,V)04)j— Lake Valley, New Mexico. (Cat. No. 47082, 



U.S.N.M.) 

 Descloizite — (Pb,Zn):(0H)V04 — Commercial mine, Georgetown, New Mexico. 



(Cat. No. 48691, U.S.N.M.) 

 Pyromorphite — (PbCl)Pb,(PO0.,— Ems, Nassau, Germany. (Cat. No. 46998, 



U.S.N.M.) 

 Mimetite—(PbCl)Pbj(As04):i— Cumberland, England. (Cat. No. 12571, U.S.N.M.) 

 Anglesite—PbS04— Monte Poni, Sardinia. (Cat. No. 51976, U.S.N.M.) 

 Crocoite— PbCrO^- Berezov, Siberia. (Cat. No. 49581, U.S.N.M.) 

 Wullenite — PbMo04 — Red Cloud mine, Yuma County, Arizona. (Cat. No. 47978, 



U.S.N.M.) 



Sulphur and its combinatioiis. — Sulphur combines with the several 

 metallic elements, forming a class of compounds of which realgar, 

 AsS; stibnite, Sb^S;!; molybdeuite, M0S2; sphalerite, ZnS, and chalco- 

 pyrite, CuFeSi, are examples. Combined with the more positive 

 metallic elements, and with arsenic, antimony, or bismuth, it forms a 

 series of compounds such as cobaltite, CoAsS; arseuoi)yrite, Fe(As,S)..; 

 proustite, Ag:,AsS:,, and tetrahedrite, CugSbiS;. Finally, its combina- 

 tion.' with the several elements unite more or less readily with oxygen, 

 forming a number of oxidized species, such as barite, BaSOjj seleuite, 

 CaS04.2H.,0, and brochantite, Cu,(OH)6S04. 



Examples. 



Orpiment- As:S :,— Hernize, Bosnia, Turkey. (Cat. No. 18367, U.S.N.M. ) 

 Stibnite— Sb:S:— Mine <le Verde da Prota, Portugal. (Cat. No. 18292, U.S.N.M.) 

 Molybdenite— MoS,—Alteuberg. Saxony. (Cat. No. 8128, U.S.N.M.) 

 Sphalerite — ZnS — Cumberland, England. (Cat. No. 49585, U.S.N.M.) 

 Galena— PbS—.Joplin, Missouri. (Cat. No. 51346, U.S.N.M.) 



Cinnabar — HgS — Pho-nixmine, NapaCounty, California. (Cat. No. 15985, U.S.N.M.) 

 Pyrrhotite — FenSi2 — Gap mine, Lancaster County, Pennsylvania. (Cat. No. 81841, 

 U.S.N.M.) 

 Pyrite— FeS;— Elba. (Cat. No. 4954.3, U.S.N.M.) 



