in an acid M-enftruum. It abounds in 

 Dorfetfnire^ and forae other Parts of Eng- 

 land. 



Cry STALL A. 



Cryflals are clear tranfparent colourlefs 

 Stones, generally found on high Moun- 

 tains, Rocks, and in Mines by a che- 

 mical Diflblution they yield Chalk and 

 Salt. They are compofed of fimple not 

 filamentous Plates not fiexile nor elallic, 

 giving Fire with Steel : not fermenting 

 in acid Menftrua and calcining in a flrong 

 Fire. The Perfection of Cryftal confifts 

 in its Luftre, Tranfparency, and Hard^ 

 nefs. It is applied to various Ufes, be- 

 ing often nianufaclured into Boxes, Cups, 

 and other Toys, Such as have Straws, 

 Dull, ^c. enclofed in them, are mofi: cu- 

 rious and rare, but^eaft fit for Ufe, Na- 

 turalifts deem the purefi: Cryftal to be the 

 original Matter of all the precious Stones 

 of the higher Clafifes, which being in ^ 

 certain Degree influenced by different mi- 



E nera! 



