212 ALBERT JOHANNSEN 



are: soda-orthoclase (OrgAbJ 69.5, basic plagioclase (anorthite 

 phenocrysts 6.1, labradorite groundmass 11. 9, average AbiAn^) 

 18.0, augite 7.4, biotite i.o, ores 3.6, apatite 0.4, titanite o. i. 



Ciminite Washington. The quartz-free ciminite has 

 a mode^ of soda-orthoclase (OrioAbj) 50.7 per cent, labradorite 

 (AbiAna) 13 . 1 per cent, augite 23 . 2 per cent, olivine 11 . 2 per cent, 

 magnetite 0.9 per cent, apatite 0.9 per cent. See note under 

 quartz-ciminite (237). 



(2313) Calcimonzonite. The original Monzoni monzonite, 

 according to Brogger, usually contains a basic plagioclase (see 

 note under 2213). In the present classification normal orthoclase- 

 acid-plagioclase rocks are included under the term monzonite 

 and orthoclase-basic-plagioclase (excluding anorthite) rocks under 

 the term calcimonzonite. 



Calcilatite. The extrusive equivalent of the preceding. 



(2314) Monzogabbro (monzonorite) . The rocks which fall 

 in this family are described in the literature as gabbros, norites, 

 or monzonites. The term syenogabbro, originally proposed^ for 

 this family, is here withdrawn, and the term monzogabbro sub- 

 stituted for reasons stated under granodiorite (229). Another 

 reason why syenogabbro should not be used for the plutonic rock 

 of this family is that, by analogy, the extrusive should then be 

 called trachy-basalt. But Boficky^ used the term trachy-basalt 

 for rocks which are now called monchiquites. 



Basalatite. Basalatite, as intermediate between basalt 

 and latite, is here suggested. It corresponds in form with its 

 deep-seated equivalent, monzogabbro. 



(2315) Gabbro von Buck. The term gabbro {granito di 

 gahhro) was used by Targioni Tozzetti"* and other writers for diallage- 

 serpentine and related rocks from Tuscany. Von Buch^ appHed 



^ Henry S. Washington, "The Roman Comagmatic Region," Carnegie Publication 

 No. 57 (Washington, 1906), p. 32. 



^ Albert Johannsen, op. cit., p. 89. 



3 Emanuel Boficky, " Petrographische Studien an den Basaltgesteinen Bohmens," 

 Arch.f. d. naturw. Landesdurchf. v. Bohmen, II (1874), Abt. ii, Th. ii, p. 44. 



■•Targioni Tozzetti, Relazioni d'alcuni viaggi fatti in diverse parti delta Toscana 

 (Firenze, 1768), II, 432. 



s Leopold von Buch, "Ueber den Gabbro" (read in Akad. d. Wissens., Berlin, 

 October 12, 1809), Magazin d. Gesell. naturf. Freunde s. Berlin, IV (1810), 128-49. 



