12 



Sfecijjc Gravities offucious Stones. 



La Medierie 



Bergman 



Werner 



Quift 



Werner 



Briffon 



Briffon 



Werner 



Briffon 



Werner 



Briffon 



Briffon 



Bergman 



Bergman •• * 



Mufchenbroeck 



Quift 



Blumenbach 



Quill 



Briffon • 



Klaproth 



Hatchett and Greville 



H. and G. 



Blumenbach 



Blumenbach 



Briffon 



Hatchett and Greville 



Quift 



Bergman • • 



Light blue. 



Topaz. 

 2,690 Siberia 

 3.460 

 3)464 

 3.500 

 3.52 » 

 3)531 

 3.536 

 3)540 

 3.548 

 3.556 

 3.564 



Brazil 



Eibenftocher 



Red. Brazil 



Dark yellow. Brazil 



Dark yellow. Brazil 



Oriental 



Schneckenfteiner 



Schneckenfteiner 

 4,010 f Oriental 

 4,560 1 

 Ruby. 



3,180 

 3,180 



3,400 Spinel 



3>4S4 Ceylon 



3,500 Brazil 



3,531 Brazil 



3)57o 



3,571 * Oftoedral cryftal 



3,625 * Made of Oaoedral cryftal 



3.64S 



3>76o 

 3.760 



4,1 66 * Salam Ruby. Star-ftonc. 

 4,200 1 

 4.240 1 

 Diamond. 



Coaft 



3.356 



3.400 



3.471 

 3.500 



3.518 

 3.520 



3.Sai 

 3,600 



Perfea cryftal 



Aggregate cryftal 



Hatchett and Greville - < 

 Wallerius _ - » 



Hatchett and Greville 

 Cronftedt ... 

 Mufchenbroeck - • 



La Metherte « > 

 Briffon - - _ 



Werner - - - . 



The Mark * diftinguiflies the ffCCimcns in my colledlign, to which I have referred in the 

 foregoing paper* 



The 



