C 120 ] 



o. White Garnet, Vefuvian, always exhibits 24 

 trapezoidal faces, found in volcanic productions ; 

 is not fufible by fire like the red. Anal. Silex 

 55. Argill 89. Lime 6. Bergman. 



p. Tourmalin^ of a deep brown, hyacinth, or 

 green colour ; does not ftrike fire with fteel ; can 

 be fcratched by a knife ; cryftallized in fix or 

 nine-fided prifms, longitudinally ftreaked, and ter- 

 minating in three-fided pyramids with pentagonal 

 faces. Is electric when heated. AnaL Silex 

 37. Argill 29. Lime 15. Iron 9. Bergman. 



q. Schorl, of various colours, red, black, 

 greyifh white, but generally green; fomewhat 

 tranfparent; fcratches glafs, "and moft varieties 

 ftrike fire with fteel ; cryftallized in fix or nine- 

 fided prifms, with three-fided pyramids. Anal. 

 Silex 52. Argill 37. Lime 5. Magnefia 3. 

 Iron 3. Chaptal. 



x. Thumerstein, Violet fchorl, vitreous appear- 

 ance, more or lefs tranfparent; cuts glafs, and 

 ftrikes fire with fteel ; found in flat rhomboidal 

 cryftals, with the two oppofite edges a little trun- 

 cated ; the furface of the fides ftreaked, and the 

 furface of truncation fmooth and fhining. AnaL 

 Silex 52. Argill 25. Lime 9. Iron 9. And 

 fome manganefe. Klaproth. 



f. Schorlite, cryftallized, indeterminate. AnaL 

 Silex 50. Argill 50. filaproth. 



t. Rubellite, cryftallized in diverging ftriated 



prifms, 



