THE MINERALOGRAPHY OF THE FELDSPARS 



2>12> 



TABLE VIII 



Tabular Summary 

 Minals 



Series 



' Microcline. Breithaupt, Jour. Ch. Ph., LX, p. 324. "Triclinic potash feldspar." 



« Camegieite. H. S. Washington, Jour. GeoL, XVI (1Q08), 10; H. S. Washington and F. E. Wright, 

 Amer. Jour. Sci. (4), XXVI (1Q08), 187, and XXIX (1910), 52-70, also XXXIV (1912), 555. 



' Anorthoclase. Rosenbusch, 1886, Mic. Pkys., 550. A triclinic soda-potash feldspar resembling 

 orthoclase. 



< Perthite. Thomsen, 1832, Shep. Min. (i), 232. Interlamination of orthoclase and albite. First 

 considered a variety of orthoclase. 



'= Plagioclase. Breithaupt, Breit. Handb., Ill, 492, General term including several triclinic feldspars. 



" Oranite. H. L. Ailing, Jour. GeoL, XXIX (1921), 235. Intergrowth of either orthoclase or micro- 

 cline and anorthite. 



7 Anemousite. See references under Camegieite. 



« Hyalophane. Waltershausen, Progg. Ann., XCiV, 134. 



» Cassinite. Lea, 1866, Acad. Nat. Sci. Proc, no. A variety of orthoclase containing barium. 

 Extended by Ailing to mean intergrowths of hyalophane and plagioclase. 1923. 



CONCLUSIONS 



To the conclusions reached in Part I, to which the reader is 

 referred, the foUowing are to be added: 



1. The degree to which the potash-soda feldspars undercool, 

 depending upon their origin, renders it impossible to construct a 



