C } 
1. ROCKS are fteril ftoner, produced by cohefion from a terrene 
origin. 
Simple, without extraneous mixture (of Salt, Sulphur or Mer- 
cury). 
Fixed, not totally foluble in any menftruum. 
Similar, of particles confufedly mixed together. 
I. Humose, from the earthy depofition of Vegetables. 
Combujlible, burning into alhes. 
In its minute particles branny, coarfer and lighter. 
a. Calcareous, from animal earth. 
Penetrable, and becoming more porous by firei 
Ih its minute particles farinaceous, when burnt falling into fs^. 
rinaceous particles. 
3. Argillaceous, from a vifeid marine fediment. 
Hardening, and becoming harder and more rigid by fire. 
In its minute particles lubricous before being burnt. 
4. Arenate, from the precipitation of aetherial fhowers. 
Scintillating, when ftruck with fteel, and very hard. 
In its minute particles rough, and angular like particles of 
broken glafs. 
3. Aggregate, and compofed of the 4 preceding fubflances. 
Participating of the condituent particles of the former ones. 
In its minuteft particles varying according to the nature of the 
materials (i- — 4) which compofe it. 
II, MINERALS are fruitful Hones, produced by cryltallization 
from a faliiic origin. 
Compound, from rock impregnated with extraneous fubftances 
(Salt, Sulphur, and Mercury). ’ 
Soluble .cnnrdy in their proper mendruum, (fome calces are 
difloluble into earth, but not totally foluble). 
Cryjlalline, certainly produced by cryHailizaiion, (before they 
have been burnt). ■' 
