58 ' ALBERT JOHANNSEN 



for quartz-free plagioclase rocks with some orthoclase. Under (229) 

 he shows the objection to the term granodiorite, an objection which 

 also appKes to the word syenodiorite. The latter term, conse- 

 quently, is here withdrawn, and monzodiorite is substituted as 

 better indicative of a rock intermediate between monzonite and 

 diorite. Leucomonzodiorite is the name of the corresponding rock 

 in Class i. 



Leucoandelatite. See note under (2214). The extru- 

 sive equivalent of preceding. Leucotrachyandesite .would be the 

 extrnisive name by analogy with granodiorite, but trachyandesite 

 has been used in the sense of latite as well as for an intermediate 

 rock of the foyaite series^ and comparable to trachydolerite of 

 the gabbro series. 



(12 1 5) Leucodiorite. According to the kind of plagioclase 

 present, the leucodiorites are divided into oligosites Turner^ 

 (oligoclasites) and andesinites Turner.^ 



Oligosite Turner. 



Andesinite Turner. 



Leucoandesite. The extrusive equivalent of leuco- 

 diorite. 



(1220) Dungannonite Adams and Barlow. A leucocratic 

 nephelite-bearing diorite with considerable corundum (13.24 per 

 cent) from Dungannon, Ontario, was described and named dun- 

 gannonite by Adams and Barlow.'' It is not typical of the family 

 on account of the presence of corundum, but the name is here used 

 since this rock is the only representative of the family yet located in 

 the literature. 



(1230) Craigmontite Adams and Barlow. The name craig- 

 montite was given by Adams and Barlow^ to a nephelite-oligoclase- 

 muscovite rock from Craigmont, Ontario. While the mode given 



^H. Rosenbusch, Mikroskopische Physio graphic der massigen Gesteine (4th ed.; 

 Stuttgart, 1908), p. 1036. 



*H. W. Turner, "The Nomenclature of Feldspathic Granolites," Jotir. Geol., 

 VIII (1900), III. 



3 Ibid. 



< Frank D. Adams and Alfred E. Barlow, "Geology of the Haliburton and Ban- 

 croft Areas, Province of Ontario," Geol. Surv. Canada, Mem. 6 (Ottawa, 1910), p. 322. 

 i Ibid., p. SIS. 



