170 



WHITMAN CROSS 

 TABLE OF NORMS 



Salic molecules — 



Quartz 



Orthoclase . . . . 



Albite 



Anorthite 



Nephelite . . . . 

 Femic molecules — 



Diopside 



Hypersthene . . . 



Olivine 



Magnetite 



Ilmenite 



Hematite 



Apatite 



VII 



45 

 3' 

 3' 



I. Prowersose, Two Buttes, Colo. 

 IV. Prowersose, Knox County, Maine. 



V. Ciminoss, Monte Catini. 

 VI. Ciminose, La Colonetta. 

 VII. Fergusose, Highwood Mountains. 



is shown, by the subjoined analysis of its norm, to be in the 

 subrang prowersose (III, 5, 2, 2). 



1^=^ = 1 .43< ^>^ = Class III, Saljemane. 

 Fern 40.3 3 5 



L {ne) 



2.4 



F {or-\-ab+an) 55.3 

 K^O' + Na^O' 80+16 



= perfelic order (5), gallare. 



7^5 



CaO' 

 Na,0' 16 



25 



3 . 8 < - > - = domalkalic rang (2), kilauase. 



=-— = 5 <->>- = dopotassic subrang (2), prowersose. 

 "^ 13 



The prowersose from Maine, while lower in salic molecules than 

 that from Colorado, is so much richer in normative orthoclase and 



rK,0'+Na,0' 



albite as compared with anorthite (- 



CaO' 



= — j that it ap- 



proaches the peralkahc rang orendase. But its ratio of potash to 

 soda is lower than for the Colorado rock; hence it does not come 

 so near to the perpotassic orendase as does the latter. There is 

 no known member of the dopotassic subrang of orendase with 

 which the prowersose may be compared. 



By consulting Washington's tables it will be seen that the only 

 other salfemanes possessing high potash greatly in excess of soda 



