t 136 i 



Fixed'^ not effervefcing with 

 nor foluble in acids. 



4. Stirium: Fibrous alabafter. Bafe-^ gypfeous 



earth. 



Fragments-, clofe, parallel, 

 yielding to the knife, 

 '5. Spatum. Spar, Bafi j calcareous earth, from 



a diffolved ftgte, form- 

 ed into. 

 Fragments 5 rhombeous, 

 plane, and poliflied, 



III. A R G I L L A C E JE. Argillaceous Stones. 



5, Talcum. Soap-earth. Bafe\ indurated clay: 



P<^r/iV/^j; impalpable, yield- 

 ing toj the knife, and 

 fomewhat undluous to 

 the touch ; hardening 

 in the fire. 



7. Amiantus. Afbeft, earth flax. Bafe clayey 4 



Fragments ; thready, 



8, Mica. Talc, Bafe-^ clay from a diflblved 



ftate, formed into. 

 Particles ; membranaceous 

 fhining, tough, fepa- 

 rable. 



IV. ARENATJE. Sand Stones. Free Stone. 



<). Cos. Whetftone, Bafe ; fand conglutinated \ 



Fragments ; irregular, fub- 

 ppake, ftriking fire 

 with 



