CLASSIFICATION OF IGNEOUS ROCKS 55 



(118) Leuco-albite-adamellite. No confusion can result here 

 from the use of the word albite as a prefix (see p. 48, above). 

 It cannot be thought to mean that the albite replaces (proxies) the 

 potash feldspar, since the term adamelhte conveys the quartz- 

 monzonitic idea, but it clearly shows that the plagioclase present is 

 albite. For the use of the term adamellite for quartz-monzonite 

 see note under (228). 



Leuco-albite-dellenite. The extrusive equivalent of the 

 preceding. 



(119) Leuco-albite-granodiorite. See note under (118). 

 (mo) Leuco-albite-tonaKte. See note under (118). For the 

 use of tonalite for quartz-diorite see (2210). 



(nil) Orthosite Turner. These rocks are leuco-potash- 

 syenites or leuco-orthosyenites. For those composed entirely of 

 orthoclase. Turner^ proposed the term orthosite. Pure anortho- 

 clase or sanidine rocks belong here also. The former might properly 

 be called anorthosites. This term, however, is now so firmly 

 attached to plagioclase rocks without mafites that no change is 

 possible. See note under anorthosite (1315). 



Sanidinite Tschermak.^ 



Microclinite Loewinson-Lessing.^ 



Anorthoclasite Loewinson-Lessing."* 

 (i 1 1 2) Leuco-albite-syenite. A temporary term for leucocratic 

 syenites, consisting essentially of orthoclase with some albite. See 

 note under (217). 



(11 1 5) Albitite Turner. Turner's^ term for rocks which con- 

 sist essentially of albite. 



(i 1 24) Leucolitch&eldite. See note under (2 1 24) . This term is 

 preferable to the longer term leuco-albite-nephelite-monzodiorite. 



^H. W. Turner, "The Nomenclature of Feldspathic Granolites," Jour. Geol., 

 VIII (1900), 106-10. 



' Gustav Tschermak, " Verhandlungen der k. k. geol. Reichs. Sitzung am 6 Marz, 

 1866," Jahrb. d. k. k. geol. Reichsanst., XVI (1866), 34. 



3 F. Loewinson-Lessing, "Kritische Beitrage zur Systematik der Eruptivgesteine," 

 Tscherm. Min. Petr. Mitth., XX (1901), 114. 



* Loc. cit. 



sH. W. Turner, "The Nomenclature of Feldspathic Granolites," Jour. Geol., 

 VIII (1900), III. 



