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of it-, for, as it is turned about, it fliews 

 almoft all Colours, as yellow, red, blue, 

 green, purple, and a milky grey. It is 

 produced in Egypt^ in Arabia^ feveral Parts 

 .of the Eaft Indies ^ and fome times in Europe : 

 The Oriental are the fineft ; but the Bo- 

 hemian^ neverthelefs, very beautiful. It is 

 often found among the Earth of Moun- 

 tains, on the Banks of Rivers, and bedded 

 in Jafper. 



Oculus Cati^ the Cafs Eye^ by fome called 

 Afteria^ is of the Nature of an Opal, but 

 harder, and fhews only two Colours, brown 

 and white \ the brown feeming to be the 

 Ground, and the white playing about it 

 in the fame Manner the Fire Colour does 

 in the Opal. This Stone takes a fine Po- 

 lifli, but is ufually worn in its natural 

 State : Its Form is for the moft Part that 

 of the half of a fmall bifedled Globe, be- 

 ing flattifh on one Side, round on the 

 other. It is found in the Eaft and Weft 

 Indies.^ and fometimes in Europe, 



^urcoisx 



