POTASH FELDSPAR 
® 
Mae 
(C) 
® ORTHOCLASE a\% \ ® OLIGOCLASE 
® MICROCLINE a8 e 9 © ANDESINE 
[gis Eo y c) 
9 ORTHOCLASE +> MICROCLINE 
© LABRADORITE 
PERTHITE 
17) 
BYTOWNITE 
© ANORTHOCLASE 
ANORTHITE 
© ALBITE UNCLASSIFIED 
90 |imE FELDSPAR 
SODA FELDSPAR !0 
i i tion with the 
i i ted are those published in connec 
Fic. r9.—Plot of 954 recast chemical analyses of natural feldspars. The names assigned to the Specie en eee Soe ae Oe aeaaeeeam 
chemical analyses and are not those which the writer would employ in many cases, Note the concentration of ee fs poate ence ee ee oe 
Plagioclase feldspars contain considerable amounts of the potash component. The almost total absence of represe 
