Washington — Suggestion for Mineral Nomenclature. 149 



Calcite Group. 

 Calcitates, R" 2 C0 3 , trigonal. 



Calcite, CaC0 3 Calcium calcitate 



Magnesite, MgC0 3 Magnesium calcitate 



Dolomite, CaMg(C0 3 ) 2 Magnesicalcium calcitate 



Ankerite, (Mg,Fe)Ca(C0 3 ) 2 Fermag-calcium calcitate 



Siderite, FeC0 3 Ferrous calcitate 



Rhodochrosite, MnC0 3 Manganese calcitate 



Feldspar Group.* 

 Feldspathotes, \ rj// A | ^ 3 - A [■ , monoclinic-triclinic. 



Adular Subgroup. 



Adularates, monoclinic. 



Orthoclase, KAlSi 3 8 Potassium adularate 



Barbierite, NaAlSi 3 O g Sodium adularate 



Celsian, BaAl 2 Si 2 8 Barium adularate 



Albite Subgroup. 



Albates, R'AlSi 3 8 , triclinic 



Microcline, KAlSi 3 8 Potassium albate 



Albite, NaAlSi 3 8 Sodium albate 



Anorthoclase, (K,Na)AlSi 3 8 Potassisodium albate 



Anorthite Subgroup. 

 Anorthates, R // Al a Si a 8 , triclinic. 



Anorthite, CaAl 2 Si 2 8 Calcium anorthate 



Carnegieite, Na 2 Al 2 Si 2 8 Sodium anorthate 



Mixed Salts. 



Oligoclase, Ab 2 An x Caldisod anorth-albate 



Andesine, Ab x An x Sodcal alb-anorthate 



Labradorite, Ab x An 2 Soddical alb-anorthate 



Pyroxene Group. 



Pyroxenotes, -j -p//V>// 2 / J-r\ [ , orthorhombic, monoclinic, triclinic. 



* The constitution and relations of the feldspars, lenads and zeolites will 

 form the subject of a subsequent paper. 



