C 90 ] 



Shapes and Sizes, generally about the 

 Size of a Horfc-bean it bears a natural 

 Polifh when found, and has the Sea green 

 Colour in all Degrees, from the dcepeft 

 to the paleft, without the Intermixture 

 of any other Colour. When this Stone 

 is in Peife6lion, it approaches to the 

 Hardnefs of a Grenate, or Garnet, but 

 is often much fofter : a very fmall De- 

 gree of Heat deprives it of its Colour. 

 It is found in the Eaji Indies^ particularly 

 the Ifland of Ceylon^ and fometimes in 

 Europe^ as in Silejia^ &c. I'hofe from 

 the warmer Eaftern Climates are much 

 tlie liardeft and fineft. 



Hyacmlhy or Jacinth^ is of a pale Ver- 

 milion Colour, or red, with a fmall 

 Admixture of yellow, ufually called a 

 Flame Colour, which Appearance it 

 probably receives from Lead and Iron. 

 It is found of various Deg-rees of Palenefs 

 or Deepnefs ; fometimes the yellow is 

 greatly predom.inant its Form is that of 

 an oblong roundifli Pebble, flatted on one 



Side. 



