430 



PROCEEDINGS OF THE ACADEMY OF 



[Aug., 



Orthosilicates; hydrous: 

 Phosphates; fluo- and chloro-: 

 Halides; fluorides: 

 Oxides; double; spinels: 



rare-earth-: 



b. Metamorphosed (additional to 

 Orthosilicates; miscellaneous: 



micas : 

 hydroxy- : 

 Oxides; 1:2: 



hydroxy-: 



c. Weathered 



Silicates; hydroxy-; zeolites: 



misc. : 



Oxides; hydroxy-: 

 Hydroxides : 



analcite 



apatite 



villiaumite, fluorite 



spinel (ceylonite) magnetite 



ilmenite, perovskite 



those of a) 



ilvaite 



muscovite 



chlorite (many varieties) 



rutile 



diaspore 



hydronephelite, natrolite, thomson- 



ite 

 kaolinite 

 bauxite; limonite 

 gibbsite 



I. 1. C. Calcic Igneous Rocks 

 a. Primary 



Silicon oxides: 

 Feldspars; orthoclases: 

 plagioclases : 



Metasihcates; pyroxenes: 



amphiboles : 

 hydrous- : 

 Orthosilicates; garnets: 



chrysolites : 

 melilites : 

 epi dotes: 

 micas : 

 rare-earth-: 

 Phosphates; fluo- and chloro- 

 Oxides; 1:2: 



double; spinels: 



rare-earth- : 

 Sulfides; 1:1: 



miscellaneous: 

 Elements; nonmetallic: 

 metallic: 



quartz 



orthoclase 



oligoclase, andesine, labradorite, 



bytownite, anorthite 

 enstatite, hypersthene; diopside, 



augite; babingtonite 

 hornblende; enigmatite, rhonite 

 analcite 

 andradite 

 forsterite, olivine 

 melilite 

 epidote 

 biotite 

 titanite 

 apatite 

 rutile 

 magnetite 

 ilmenite ; perovskite 

 pyrrhotite, pentlandite 

 pyrite; chalcopyrite 

 graphite 

 iron 



