76G 



REPORT OF NATIONAL MUSEUM, 1897 



OXYGEN salts: CLASS,— SKLKNITKS ANlJ TKLLUKI'IKS. 



The selenites and tellurites, derivatives of Se(OH)4 and Te(OH)4, or 

 compounds of oxides with oxides whose more negative parts are taken 

 by selenous and telhirous oxides, have but few representatives among 

 minerals, and these are of rare occurrence. 



Molybdoiiieuite. 

 Kersteuite. 

 Cobaltoinenite. 

 Cbalcomt'iiite. 

 Enniiousite. 



Durdeuite. 



(iron J) 1. 

 Pl)SeO:i. 



CoSeO;,. 



CuSeO,. 



Tellurite of iron. 



(Iroxp :3. 

 Fe.2(TcO;i)...4HaO. 



OXYGEN salts: CLASS, — CARBONATES. 



Ortliorlioinl>ic. 



(?) 

 Moiioclinic. 

 Monoclinic (?). 



The carbonates, derivatives of Il^CO), or comjjoniids of carbon diox- 

 ide with other oxides, form a numerous and iini)()rtantclas8 of minerals. 

 They may be conveniently arranged as follows: Normal carbonates, 

 compounds in which the ratio of oxygen in the carbon dioxide to the 

 oxygen in the combined oxide is as !i:l; basic carbonates, compounds 

 in which the ratio of the number of the oxgyen atoms in the dioxide 

 to that of the combined oxide is less than 2:1; lluo and chlorocar- 

 bonates, compounds in which there is a fluoride or chlt)ride with a 

 carbonate of the same element. 



Calcite. 



Bnumerite. 



Keicbite. 



Hislopite. 



Tbinolite. 

 Dolomite. 

 Ankerite. 

 Maj^nesite. 



Brenunerite. 

 Mesitite. 



Pistoniesite. 

 Siderite. 



Siderodot. 



Thomiiite. 



Oligonite. 

 Rhodocbroaite. 



Manganocalcite. 

 Smitbsouite. 



Monboiniite. 

 Sphierocobaltite. 



A. NORMAL CAKHONATES. 



Group 1. 



a. Khombohedral section. 



CaCO;,. 



(Ca,Mg)CO:,. 



(Ca,Mg,Fe,Mn)C03 



MgCO,. 



(Mg,Fe)C03. 



FeCO;,. 



MnCOs. 

 ZnCO:,. 

 CoCO;,. 



