6o GEORGE I. FIN LAY 



I. SALIC GROUP 

 Dominantly Siliceous and Aluminous 



A. Quartz SiO^ Q. 



Corundum AI2O3 C. 



Orthoclase K,O.Al3 03.6SiO, or. 



Albite Na.O.Al.Oj.eSiO^ ab. 



Anorthite CaO.Al2 03.2Si02 an. 



Leucite K^O.Al^ 03.48102 Ic. 



Nephelite Na20.Al203.2Si02 ne. 



Kaliophilite K,O.Al203.2Si02 kp. 



B. Minor inflexible molecules 



Sodalite 3(Na,O.AL03. 28102). 2NaCl so. 



Noselite 2(Na20.Al203. 28102). Na3804 no. 



Zircon Zr02.8102 Z. 



Of the salic minerals kaliophilite is very rare, while sodalite, noselite, 

 and zircon are much less rare but still unusual. (See note at end of 

 paper on the substitution of halite, NaCl [HI], and thenardite [Th], 

 Na2S04, for sodalite and noselite, respectively, among the salic 

 minerals.) 



II. FEMIC GROUP 



A. Dlopslde CaO.(MgFe)0. 28102 dl. 



Hypersthene (MgFe)0.8i02 hy. 



Olivine 2(MgFe)0.Si02 ol. 



Acmite Na20.Fe203.48102 ac. 



Sodium metasilicate NaoO.SiOa ns. 



Potassium metasilicate K20.8i02 ks. 



WoUastonite CaO.SiOj wo. 



Ackermanite 4CaO. 38102 am. 



B. Minor inflexible molecules 



Magnetite Fe203.FeO mt. 



Ilmenite FeO.Ti02 il. 



Chromite FeO.Cr203 cm. 



Hematite Fe203 hm. 



Titanite CaO.TiO2.SiO2 tn. 



Perofskite CaO.Ti02 pf. 



Rutile Ti02 ru. 



CaCU 

 Apatite 3CaO.P20s. or 



CaFa 



3CaO.P20s. ap. 



Fluorite CaF2 ft. 



Calcite CaO.C02 cc. 



Pyrite FeSa pr. 



