EOCK-POEMINa MINEEALS 





individual characteristies of the roeks of wkieh they form a 

 part may be better understood. In passing them in review 

 we will also note briefly the characteristic alteration and de- 

 composition products to which they may give rise, though the 

 cause of such changes must be left for another chapter. 



A. Original Minerals. 



1. 



Quartz. 





6 a. Muscovite. 



2. 



The Feldspars. 





6 6. Biotite. 





2 a. Orthoclase. 





6 c. Phlogopite. 





2 &. Mierocline. 



7. 



Calcite (and Aragonite) 





2 c. Albite. 



8. 



Dolomite. 





2d Oligoclase. 



9. 



Gypsum. 





2 e. Andesine. 



10. 



Olivine. 





2/. Labradorite. 



11. 



Garnet. 





2 g, Bytownite. 



12. 



Bpidote. 





27i. Anorthite. 



13. 



Zoisite. 



3. 



The Amphiboles- 



14. 



Andalusite. 





3 a. Hornblende. 



15. 



Staurolite. 





3 &. Tremolite. 



16. 



Scapolite. 





3 c, Actinolite. 



17. 



Elseolite and Nepheline. 





3d. Arvedsonite. 



18. 



Leucite. 





3 e. Glaucophane. 



19. 



Sodalite. 





3 /. Smaragdite. 



20. 



Hauyn (nosean). 



4. 



The Monoclinic Pyroxenes. 



21. 



Apatite. 





A a, Malacolite, 



22. 



Menaccanite. 





4&. Diallage. 



23. 



Magnetite. 





4 c. Augite. 



24. 



Hematite. 





4d. Acmite. 



25. 



Chromite. 





4 6. ^gerite. 



26. 



Halite (common salt). 



5. 



The Rhombic Pyroxenes. 



27. 



Fluorite. 





5 a. Enstatite (Bronzite). 



28. 



Graphite. 





5 6. Hypersthene. 



29. 



Carbon. 



6. 



The Micas. 



30. 



Pyrite. 





B. Seconda 



BY Minerals. 



1 



Quartz. 



3. 



The Amphiboles. 





la. Chalcedony. 





3 a. Hornblende. 





I'd. Opal. 





3 6. Tremolite. 





1 c. Tridymite. 





3 c. Actinolite. 



2. 



Albite. 





3 d, Uralite. 



