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163 



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Outlines of the Mineralogy and Geology 



The streak is similar, and in the lighter coloured specimens, 



whitish. * . 



It is hard. 



The fracture is fine splintery, fine grained uneven, and flat 

 conchoidal; proraiscuous and fascicularly diverging radiated. 



It is hrittle. 



The crystallized varieties are easily frangible; the amor- 



phous are tough. 



The fragments are splintery, indeterminately angular, and 



not sharp edged. 



« 



Its specifick gravity is about 8.368, 



' V 



Chymical Character, 

 Before the blowpipe fuses into a dark green glass or enamel 



• . • 



Geological Situation and Localities. 



» 



Epidote is found in most of the rocks in the 



ty of Bos 



they 



chiefly to the presence of 



mineral. It traverses Greenstone. Sienite and Petrosilex in veins, 

 which are sometimes several inches thick ; it is disseminated in 



Amygdaloid at Brighton ; and it frecjuently lines cavities in Preh- 



nite. The finest specimens are found at Nahant, where it also 

 occurs in the greatest abundance. 



Remarks. 



No miueral has been so unfortunate in its number of names 

 as Epidote, and it has only recently been admitted as a distinct 

 species. It will not be always easy to recognize it by its exter- 

 nal characters, but its habitudes before the blowpipe will readily 

 distinguish it from Prase and Jade, with which it has frequently 



been confounded by mineralogists in this vicinity. 



