56 ALBERT JOHANNSEN 



(1125) Leucomariupolite. See note under (2125). It is a 

 leuco-albite-nephelite-diorite . 



(1131) Here belong rocks consisting of one or more feldspath- 

 oids, without feldspars or dark constituents. The type rock 

 is pure nephelite. For the corresponding extrusives Loewinson- 

 Lessing^ proposed noseanite, nephelinolith, and amphigenite. 

 Noseanite, however, was previously used by Boricky^ for an 

 amphibole-(plus 50 per cent) nephelite- (20-40 per cent) noselite 

 rock with small amounts of magnetite and olivine, while amphi- 

 genite was used by Cordier^ for rocks now called leucite-tephrites. 

 Sodalitsten Steenstrup'' probably belongs to this family. 



CLASS I, ORDER 2 



(i2o) These rocks are included under Order i, since the varia- 



tions produced by small amounts of different plagioclases are un- 

 essential. 



(i2i) Included under Order i. 



(122) Granite-greisen Jokely. Syn. : Feldspathgreisen Jokely. 



Jokely^ applied the term Granit- or Feldspathgreisen to rocks con- 

 sisting essentially of quartz and feldspar with some muscovite. The 

 feldspar was determined megascopically only and was spoken of 

 as"allem Anschein nach durchganglich Orthoklas." If ordinary 

 granites are divided into orthogranites and normal granites, so 

 also should the granite-greisens be divided, and there would be 

 orthogranite-greisens (121) and granite-greisens (122). But (121) 

 is the hinge family and is the same as (in); consequently the 

 former name need not be considered, and the term granite-greisen 

 can be applied to the quartz-feldspar rock of Family 2, The 

 presence or absence of muscovite will not change the classification, 



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

 IV," Tscherm. Min. Petr. MiUk, XX (1901), 114. 



* Emanuel Boricky, " Petrographische Studien an den Basaltgesteinen Bohmens," 

 Arch.f. d. naturw. Landesdurckf. v. Bohmen, Band II, Abt. ii, Th. ii, pp. 41, 78-79. 



3 Cordier and d'Orbigny, Description des roches (Paris, 1868), pp. 114-15. 



*N. V. Ussing, "Mineralogisk-petrografiske Undersogelser af Gronlandske 

 Nefelinsyeniter og beslaegtede Bjaergarten, 1894," Meddel. om Gronl., XIV (1898), 128. 



sjohann Jokely, "Das Erzgebirge im Leitmeritzer Kreise in Bohmen," /o/sri. 

 d. k. k. geol. Reicksanst., IX (1858), 567. 



