COLLKCTIONS IN ECONOMIC GEOLOGY AND METALI.lU(iY. 175 



caiboiiatt*. To ri'pivst'iit the occ.iirreiicr of >|>ii,ilciil'.' liflcrii spi'ciiiH'Hs 

 art' sliowii : 



(I) C'iMuplicatt'd crvHtals, iini'lK^rl. Cowan iV IUi>^ M iin-, l.i-lii;;li. .I;i^|ifi- ( 'miiity, 

 Missouri. (.^fjOtivi. ) 



(*2) Uoiiiplicatcd crystiils. on clicrt. (.'owiiii iV IUi>.s Mim-, Iicliij»li, .hisinr Comity, 

 Missouri. (.V)(H1.) 



{'.\) Crystals, with ronj^iu-ucil surtatM.'s, on iiuartz. Siieiicer A McCoiiey Miiio, Car- 

 torvillf, Jasper Conuty. .Missouri. (.Vil.').'*.) 



(4) Comi»lioatoil crystals, iutfriar o|' a irnotU', with a lilth* <;hiri, L'-lii^ili. Jasper 

 Comity, Missouri. (Sf)!!);*.) 



(5) Coiuplicatcil crystals, with a tow orystalsof calcito. Cartervillc. J.ispr-r (.'oiiuty, 

 M isso iiri . ( '>r)'i04 . ) 



(()) Complicated crystals, with calcito aud chert. Spencer A: McCom-y Mine, Cai- 

 tcrville, Jasper Couuty, Missouri, (r).")!^.^. ) 



(7) Larjje complicated «;rystals, with sniuU simple crystals, many <>1' the !ar>^e crys- 

 tals coated with marcasite. Spencer «,V- MtCom-y Mine, Cartervilie, Jasper County, 

 Missouri. (r)51'.?"2.) 



(8) Small simple crystals, on massive. Cowan iV,; Hiiss mine, Lehif^h. .Jasper 

 County, Missouri. (.">.')077.) 



(9) Separate crystals, on quartz. Spencer «fe McCom-y mine, Cartervilie, Jasper 

 County, Missouri. (r).'>l,')4.) 



(10) Finely crystallized, on massive. Skeeterville, Lehij^h, Jasper Couuty, Mis- 

 souri. (5r)'.i08.) 



(II) Crystals, coated with greenockite (sulphide of ca<lmium). Cranby, Xewton 

 County, Mi.ssouri. (.')61l(i.) 



(12) Massive, containintj a little pyiite. Friedensville, Lehigh County, Pennsyl- 

 vania. (6.0121.) 

 '13) Massive, with calcite. Buttzville, Warren County. New Jersey. (.')tJ:}90. ) 

 ( 14) Massive, with calcite. Oxford furnace, Warren Couuty, New Jersey. (44187. ) 

 (ir>) Showing characteristic dodecahedral cleava^jje. Galena, Cherokee County, 

 Kansas. (56210.) 



WILLEMITE. (TROOSTITE.) 



Composition: Zii^SiU^. Silicate of zinc, containing oxide of zinc, 

 72.9 per cent, (zinc 58.5 percent.), and .'^ilicic acid, 27.1 per cent. 



It crystallizes in the rhoinbohedral system, bnt crystals are rare. It 

 generally occurs massive, or disseminated in grains. Its hardness is 

 5.5, and specific gravity about 4. Occurs only in Sussex Couuty, New 

 Jersey, in suflicient amounts to constitute an ore of zinc, but quite 

 common there. To ilhistrato the occurrence of willcmite four speci- 

 mens are shown : 



(1) Ma.S8ive, lirown iuitl ^rttn, witli a little Krankiinitf. Iranklui, New .Jersey. 

 (176:W.) 



(2) Ma.ssive, green, with a little Kranklinite. Franklin, New Jersey. (t»53i;{.) 

 (:j) Massive, yellow, with a little Franklinite. Franklin, New Jersey. (17r>41.) 

 (4) Massive, yellow and green, with a little Franklinite. Franklin, New Jersey. 



rCK-.:U4.> 



CALAMINE. (GALMEI.) 



Composition : Zu^SiOi-f aq. Ilydrated silicateofziiu", containing ox- 

 ide of zinc t)7.."» i)er cent, (zinc ."» 1.2 per cent.), silicic acid 2.'» per cent., 

 and water 7.5 ])erccnt. 



