C 18 3 



CLASS I. ROCKS. 



L HUMOSE. 



I* Schist, fillile, 



II. CALCAREOUS. 



2. Marble, of no determinate fhape, efFervefcing. 



3. Gypsum, of no determinate (hape, fixed. 



4. Stirium, fibrous. 



5. Spar, rhombic. 



in. AGILLACEOUS. 



6. Talc, folid. 



7. Amiant, fibrous* 



8. Mica, fcaly. 



IV. ARENATE. 



9. Sand-stone, of granular fragments. 



10. Quartz, of angular fragments. 



11. biLEX, of convex fragments. 



V. AGGREGATE. 



12. Rock, of mixed heterogenoous particles. 



