2i8 ALBERT JOE ANN SEN 



by Barrell/ It is hardly typical of the family, however, since it 

 is near the boundary of Class 3. See note under (2 11 2). 



(2413) Anorthite-monzonite. See note under (2 113). 



(2414) Anorthite-monzogabbro. See notes under (21 14) 

 and (2314). 



(2415) Anorthite-gabbro. Here belongs an anorthite-augite 

 dike rock from the Carlingford district, Ireland, with the percent- 

 ages 62 and 38 according to a calculated analysis by Roth.^ The 

 corresponding extrusive rock, with more than 50 per cent anorthite, 

 33 per cent augite, and 8 per cent magnetite, was described as 

 anorthite-diabase by Tschermak.^ 



Another rock belonging to this family is kyschtymite Moroze- 

 wicz,'' an anorthite-corundum rock, occurring as an intrusive in 

 granite in Kyschtym in the Urals. Still another is allivalite 

 Harker,^ occurring on AUival, a mountain on the Isle of Rum and 

 consisting of anorthite and olivine.^ Finally, there is rougemontite 

 O'Neill,^ containing anorthite 52.25 per cent, augite 32.51 per 

 cent, olivine 8.35 per cent, hornblende 0.43 per cent, and iron 

 ore 6.52 per cent. 



CLASS 3, ORDER I 



(316) Mela-orthogranite. In this family fall two rocks, 



Prowersose (of the quantitative system of C.I.P.W.), described by 

 Cross,^ a dike rock from Two Buttes, Colorado, and a similar rock 



^Joseph Barrell, "Microscopical Petrography of the Elkhorn Mining District, 

 Jefferson County, Montana," U.S. Geol. Surv., Ann. Rept., XXII, Part II (1901), 

 P- SiQ- 



^ J. Roth, Gesteinsanalysen, Ivii. The rock was originally calculated by 

 G. Haughton (Quart. Jour. Geol. Soc, XII [1856], 197) as anorthite 85.84 per cent 

 and augite 14.16 per cent, which was shown to be wrong by Roth. 



3 Gustav Tschermak, "Uber secundare Mineralbildungen in den Griinsteingebirge 

 bei Neutitschein," Sitzungsber. d. Wien Akad. d. Wiss., XL (i860), 127. 



■fj. Morozewicz, "'Kyschtymit — ein Korund-Anorthitgestein," Tscherm. Min. 

 Petr. Mith., XVIII (1898), 202. • 



s Alfred Harker, "Igneous Rocks from the Ultrabasic Group of the Isle of Rum. 

 Summary of Progress," Geol. Stirv. (1903), p. 56. 



* J. W. Judd, "On the Tertiary and Older Peridotites of Scotland," Quart. Jour. 

 Geol. Soc, XLI (1883), 389-90, 395- 



7 J. J. O'Neill, "St. Hilaire (Beloeil) and Rougemont Mountains, Quebec," Geol. 

 Surv. Canada, Mem. 43 (Ottawa, 1914), p. 77. 



^Whitman Cross, "Prowersose (Syenitic Lamproph3Te) from Two Buttes, Colo- 

 rado," Jour. Geol., XIV (1906), 165. 



