C 71 ] 



Florence Marble for the moft part bears a 

 natural Refemblance to the Ruins of 

 Towns, Rocks, ^c. 



Alabafter is of the fame Nature as Mar- 

 ble, but of one fimple Colour, more brit- 

 tle, fofter, and, when cut into thin Plates, 

 femi-tranfparent. 



Spata. Selenites. 



In this Repofitory are Spars and Moon- 

 ftones. The Spar is a fliining Stone, 

 conlpoled of cryftaline and earthy Mat- 

 ter i it does not ftrike Fire with Steel, but 

 yields a whitifli Powder on Calcination. 

 When pure it is pellucid and colourlefs, 

 has the appearance of Cryftal but wants 

 its diftinguifhing Charafters ; it ferments 

 violently with acids, and is wholly folu- 

 ble in them. Spars are frequently found 

 in Caves, Grottos, Clefts of Rocks and 

 Mines \ they Ihoot like Salts in Spires and 

 other Figures, and abound in many Parts 

 of England. 



Selenites 



