I) 



Form to be Used in the Study of the Durability of Important Soil-Forming Minerals. 



1. (a) Name (b) Color. 



(c) Transparency 



2. Cleavage 



3. Hardness - 



4. Solubility 



5. Porosity 



Conclusion as to Durability 



1. (a) Name (b) Color. 



(c) Transparency 



2. Cleavage — 



3. Hardness • 



4. Solubility 



5. Porosity -. . « 



Conclusion as to Durability 



