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iietic needle at the diftance of a line afid 

 three-fourths. Minute grains of quartz, nu* 

 merous fcales of feltfpar, and extremely fmall 

 and brilliant needles of fhoerl are incorpo- 

 rated in this lava. 



The furnace fufes the fhoerls,but not the 

 quartz, and the feltfpars; and the lava is 

 changed into a black, frothy, and opakc 

 enamel. 



This lava extremely refembles the prlf- 

 matic lava defcribed above ; though it has 

 not that regular configuration. 



The lava of the fecond fpecies is likewife 

 of the horn-ftone bafe ; not very hard nor 

 heavy ; of a cinereous and earthy afpe<£t, 

 without pores, attaches flightly to the infide 

 of the lip, and emits an argillaceous odour. 

 The fhoerls it contains are rhomboidal, fcaly, 

 and of a violet colour. 



In the furnace it is only foftened ; and 

 the (hoerls remain entire, 



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