438 



PROCEEDINGS OF THE ACADEMY OF 



[Aug. 



Sulfides, arsenides, etc.; 

 sulfo-salts; 1:1: 



3:2: 



3:1 



basic : 



arsenates, etc. 



Elements : 



zinkenite, andorite, sartorite, 

 emplectite, chalcostibite, smith- 

 ite, trechmannite, matildite, 

 galenobismutite, berthierite, 

 hutchinsonite, lorandite, miar- 

 gyrite 



plagionite, klaprotholite, baum- 

 hauerite, schirmerite, warren- 

 ite, dufrenoysite, cosalite, 

 rathite, schapbachite, jameson- 

 ite, koljellite, brongniardite, 

 semseyite, diaphorite, freiesle- 

 benite 



bournonite, wittichenite, aikinite, 

 boulangerite, lilianite, stylo- 

 typite, guitermanite, tJapalpite; 

 proustite, pyrargyrite; pyro- 

 stilpmte, rittingerite 



tennantite, tetrahedrite, jordan- 

 ite, meneghinite, geocronite, 

 stephanite, kilbrickenite, ])ee- 

 gerite, pearcite, polybasite, 

 polyargyrite 



enargite, famatinite, xantho- 

 conite, epiboulangerite, epi- 

 genite, canfieldite, argyrodite, 

 franckeite, cylindrite 



arsenic, allemontite, antimony, 

 bismuth, copper, silver, gold 



b. Metamorphosed: Many of the above minerals are also produced 

 by metamorphism 



Weathered 

 Silicon oxides: 

 Silicates: hydroxy-: 

 Carbonates; calcites: 



aragonites : 

 anhydrous- 

 chloro-: 



quartz, chalcedonj^, opal 

 dioptase, calamine, chrysocolla 

 calcite, siderite, smlthsonite, 



spherocobaltite 

 aragonite, cerussite 

 bismutospherite 

 phosgenite 



