of Boston and its Vicinifn. l^b 



Chymical Characters, 



It is infusible before tbe blowpipe ; but totally soluble in dilut, 

 d nitrick or muriatick acid with effervescence. 



Geological Situation and Localities. 

 It occurs in tbin veins in Wacke, at Milton and Needham 



Rare 



Remarks. 



Tbe fossil bears great resemblance to Fibrous Gypsum, for 

 which this has probably been taken by some mineralogists in this 

 vicinity, or who have visited this part of our country, but its 

 chymical characters sufficiently distinguish it from Gypsum. 



Subspecies IV. — Compact Limestone, 



Compact Lijaestone, Cleavelandy p. 157. Common Compact Limestone, Jamt^ 

 mn, vol. I. p. 477, Common Limestone, Mkin,^. ir6. 



External Characters. 



Its colours arc white, greyish white, and Yellowish white 

 Its lustre is glistening and pearly. 



It is translucent. 

 It is amorphous. 



The streak is similar. 

 It is semi hard. 



The fracture is fine grained uuevett. 



It is brittle. 



It is easily frangible* 



The fragments are uudeterminEftcIy angular* 



