i62 ALBERT JOHANNSEN 



cancrinite as an essential constituent .... and many of the speci- 

 mens show none Some of it is certainly secondary." The 



rocks of this family may therefore be divided into 



Litch&eldite (normal). 



Cancrinite-litchfieldite. 

 The calculated mode of canadite Quensel"" places it in this 

 family, but the actual mineral composition may be quite different. 

 QuenseP says that "a rock entirely consisting of nephelite, albite, 

 and a mafic mineral may or may not be a canadite, depending upon 

 the presence or absence of a certain amount of normative lime- 

 feldspar." Depending thus upon chemical composition for its 

 name, it is excluded here. 



(2125) Mariupolite Morozewicz. Morozewicz^ described cer- 

 tain rocks from the shores of the Sea of Azof which consist of much 

 albite, less nephelite, and some ferromagnesian constituents and 

 zircon. He gives two modal analyses, determined microscopically, 

 both of which fall in this family somewhat above the center 

 point. 



(2126) Naujaite Ussing. Several nephelite- and leucite- 

 syenites belong here, as does also arkite Washington.'* The latter, 

 however, is tod poor in feldspar to be typical of the family, and it 

 carries garnet as an essential. Naujaite Ussing^ is the rock origi- 

 nally described by Steenstrup^ as a sodalite-syenite. Pending the 

 location of a nephelite-rich orthofoyaite or orthoditroite, naujaite 

 may represent the family. 



Syn.: Sodalite-syenite Steenstrup. 

 Arkite Washington. 



^ Percy Quensel, "The Alkaline Rocks of Almunge," Btdl. Geol. Inst. Upsala, 



XII (1914), 135, 176-77- 



^ In litteris, May 16, 1915. 



3 J. Morozewicz, "tJber Mariupolit, ein extremes Glied der Eleolithsyenite," 

 Tscherm. Min. Petr. Mitth., XXI (1902), 245. 



4 Henry S. Washington, "The Foyaite-Ijolite Series of Magnet Cove: A Chemical 

 Study in Differentiation," Jour. Geol., IX (1901), 617. 



sN. V. Ussing, "Geology of the Country around Julianehaab, Greenland," 

 Meddel. om Gronl., XXXVIII (1911), 32, 143-56. 



* K. J. V. Steenstrup, " Bemaerkninger til et geognostisk Oversigtskaart over en 

 Del af Julianehaabs Distrikt (den 20 Juni 1878)," Meddel. om GronL, II (1881), 35. 



