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CLASS I. ROCKS. 
I. HUMOSE. 
1. Schist, fiflile. 
II. CALCAREOUS. 
2 . Marble, of no determinate fhape, efFervefcingw 
3. Gypsum, of no determinate fhape, fixed. 
4. Stirium, fibrous. 
5. Spar, rhombic. 
III. AGILLACEOUS. 
6. Talc, folld. 
7. Amiant, fibrous. 
8. Mica, fcaly. 
IV. ARENATE. 
o. Sand-stone, of granular fragments. 
10. Quartz, of angular fragments. 
11. SiLEX, of convex fragments. 
V. AGGREGATE. 
12. Rock, of mixed heterogeneous particles. 
