468 



Outlines of the Mineralogy and Geology 



It is easily frangible. 



# 



The fragments are splintery. 

 The specifick gravity is about 3.66 



Cliymical Character, 

 It fuses before the blowpipe into a yellowish glass 



Geological Situation and Locality. 



n 



It occurs massive and disseminated in Carbonate of Lime 

 Chelmsford. 



9 



Sit 



SPECIES XllL^COMHrOJ^ .aSBESTUS. 



Common Asbestus, Cleaveland, p. 326. Common Asbest, Jameson, vol. i. 

 p. 4i6. Idem, ^ikin, 247. Asbestus, KirwaUj vol. i. p. 159. 



External Characters, 



Its colour is light greenish grey. 

 Its lustre is glistening, and pearly. 



It is opaque. 



It is amorphous. 



It has a very slightly unctuous feel. 



It exhales an argillaceous odour when breathed upon. 



It adheres slightly to the tongue. 



The streak is light ash grey. 



It is flexible in thin fibres. 



It is soft, passing to very soft. 



The cross fracture is fine splintery ; the longitudinal fracture 



is capillary parallel fibrous. 

 It is moderately tough. 



-»!, 



