CLASSIFICATION OF IGNEOUS ROCKS 



659 



TABLE VI. 



JANEIROSE (PSEUDO-LEUCITE-SODALITE-TINGUAITE) BEAVER CREEK, 



BEARPAW MOUNTAINS, MONT. 



Bull. 1 68, U. S. Geo/. Sttrv.,p. 136. 



SiO< 



A1 3 3 

 Fe o 3 

 FeO .. 

 MgO . . 

 CaO.. 

 Na„0. 



K 3 0.. 

 H a O+ 

 H 2 0- 

 TiO,.. 

 P 3 5 . 

 SrO .. 

 BaO.. 



so 3 .. 

 co... 



CI.... 

 F .... 



51-9; 



29 



59 

 ,20 

 ,22 

 65 

 49 



9.81 

 10 



99 

 20 

 06 

 07 

 09 

 67 



25 

 70 

 27 



100.31 



.200 

 .022 

 .018 

 .006 

 .030 

 •137 



104 



002 

 000 

 001 

 001 

 009 

 006 

 020 

 014 



Fluor. NaCl. 



I I 



so;. 



Cal" 



Orth. Leuc. Nep. 1 Acm. Diop. Oliv 



390 I 156 



104 



192 

 96 



96 



88 



1 For nephelite, sodalite, and noselite. 



6.r + 4JJ 7 = 546 (Si0 2 ) 



X + y = ^04 (K 2 0~) 



x= 65 



^=39 



FORMULA. MOL. WT. 



K„O.Al„0 3 .6Si0 2 - - -65X556 



K^O.A^0 3 .4SiOo - - - 39X436 

 NaoO.Al„0 3 .2SiOo - - -48X284 



3(Na,O.Al„0 3 .2SiO„)2(NaCn 10 X 969 



2(Na 2 O.Al 2 "0 3 .2SiOJNa,S0 1 9X699 



Na„0.Fe„0 3 . 4 Si0, - - - 22X462 



•CaO.SiO; - - - - 17X116 



MgO.Si0 2 5 X 100 



FeO.SiO, - - - - 14 X 132 



1 2MgO.Si0 2 - - - - 1 X 70 



1 2FeO.Si0 2 - - - - 2 X 102 



FeO.Ti0 2 2 X 152 



CaF„ 7 X 78 



CaO. CO, - - - - - 6 X 100 



= orthoclase = 

 = leucite= 

 = nephelite = 

 = sodalite 

 = noselite 

 acmite 



diopside 



olivine 



ilmenite 



rluorite 



calcite 



NORM. 



36.14 

 i7.oo~| 

 13-63 l 

 9.69 f 

 6.29J 

 10. 16 



4.32 



H,0 



•3° 



• 55 

 .60 

 [.09 



36.14 

 46.61 



Sal. 82.75 



Fem. 15.60 



