174f 



Outlines of the Mineralogy and Geology 



SPECIES XVl,-^CHLORITE. 



Subspecies I. — Common Chlornte, 



Common Chlorite, Cleavelandf p. 555. Idem, Jameson^ vol. i. p. 349. Idem, 



Aikin,^. 217 



External Characters. 



Its colour is blackish green. 



Its lustre is faintly glimmering. 



It is opaque. 



It is amorphous. 



It has a slightly unctuous feel. 



It exhales a faint argillaceous odour when breathed upon. 



The streak is mountain green. 

 It is very soft. 



The fracture is fine grained uneven, passing to earthy,. 



It is moderately tough. 



It is easily frangible. 



The fragments are indeterminately angular and blunt-edged 



The specifick gravity is about S.953. 



Chymical Character. 

 Before the blowpipe it melts into a black scoria. 



Geological Situation and Localities, 

 It occyirs in thin layers in Greenstone and Argillite, at 



I 



Charlestv)vvn, and^ massive in Quartz, at Newton, Needham, 

 Brighton, &c. 



