344 



CHEMICAL COMPOSITION OF MINERALS. 



Celestine (110), 



SrS* 



Strontianite (111), 



SrC 



Gypsum (112), 



CaS-f-2H 



Anhydrite (114), 



OaS ' 



Calcite (115), 



CaC 



Aragonite (118), 



CaC 



Dolomite (119), 



(Ca, Mg)C 



Apatite (120), 



Ca 3 £+£Ca(Cl, F) 



Fluor spar (121), 



CaF 



Epsomite (Epsom salt, 124), 



MgS+7H 



Magnesite (124), 



MgC 



Brucite (125), 



MgH 



Boracite (126), 



Mg 3 B 4 



Potash alum (121), 



KS+3clS 3 +24H 



Soda alum (128), 



NaS+XlS 3 +24H 



Alunite(129), 



KS+3X1S+6H 



Wavellite (130), 



(Xl*iP 3 +18H)+£AlF* 



Gibbsite (131), 



XlH3 



Quartz (132), 



5i 



Opal (139), 



Si(+Aq.) 



Wollastonite (141), 



Ca 3 *Si 3 



Datholite (142). 



(Ca 3 , H 3 , B)Si f 



Talc (143), 



Mg6Sis+2H 



Chlorite (145), 



(R 3 , S)Si f +l£H 



Ripidolite (145), 



(R 3 , K)#-f-l£H 



Serpentine (145), 



Mg 3 Si 2 + ]£MgH2 



Meerschaum (148), 



MgSi+H? 



Clintonite (148), 



(fe*,as)(Si,si)*-H-fi 



Pyroxene (150), 



(Mg, Ca, Fe, Mn) 3 Si 2 



Hornblende (152), 



(Mg, Ca, Fe,Mn) 4 Si 3 



Spodumene (156), 



(Li,fra) 3 Si 2 +4XlSi» 



Chrysolite (157), 



(Mg, Fe, Ca)3Si 



Chondrodite (151), 



(Mg, Fe) 4 Si 



Corundum (158), 



XL 



Spinel (160), 



(kg, xi) 



Automolite (var. of Spinel, 161), 



2nXl 



Hercinite, " 



FeXl 



Ceylanite, " 



(Mg, Fe)X» 



Dysluite, " 



(2n, Mn) (Xi, ^e) 



