428 



PROCEEDINGS OF THE ACADEMY OF 



[Aug., 



4. Fumerolic deposits 



(No chemical or historical subdivision practicable) 



II. Sedimentary Phenomena 



1. Sediments 



A. Siliceous (including argillaceous) 



B. Calcareous (including magnesian) 



C. Ferruginous (including manganiferous and zinciferous) 



D. Saline 



E. Phosphatic 



F. Carbonaceous 



Each of the above divisions is subdivided as follows: 



a. Primary 



b. Metamorphosed 



c. Weathered 



The Classification Applied to Minerals 



I. 1. A. Silicic Igneous Rocks 



a. Primary 



Silicon oxides: 

 Feldspars ; orthoclases : 



plagioclases : 

 Metasilicates ; pyroxenes : 

 amphiboles : 

 miscellaneous : 

 Orthosilicates : garnets : 



chrysolites : 

 epidotes : 

 micas: 

 boro- : 



fluo-: 



rare-earth- : 

 Phosphates; fluo-: 



rare-earth- : 

 Halides; fluorides: 

 Oxides; 2: 3: 

 1:2: 

 double; spinels: 



quartz, tridymite 



orthoclase, anorthoclase, micro- 



cline 

 albite, oligoclase 

 augite; spodumene; rhodonite 

 hornblende 

 iolite 



almandite, andradite 

 fayalite 



epidote, allanite 

 muscovite, biotite 

 axinite; black tourmaline; duuKjr- 



tierite 

 topaz 



zircon; gadolinite; titanite 

 apatite 



monazite, xenotime 

 fluorite 



corundum, hematite 

 rutile, cassiterite 

 spinel (ceylonite), magnetite 



