[ i6* ] 



a. Calcareo Siliceous Ore; found near Paffau % 

 difcovered and defcribed by Profeffor Hunger; 

 of a reddifh, yellowifh, or blackifh-brown colour ; 

 found maffive or diffeminated ; but more fre- 

 quently cryftallized in obtufe-arigled tetrahedral 

 cryftals ; found feated on, or inhering in gneifs or 

 granite ; foliated or ftriated ; cuts glafs. Kirwan. 

 Anal. Silex 35. Calcareous earth 33. Titanitic 

 calx 33. Klaproth. 



W. CHROME. 



CHROME, fo called from it's property of co- 

 louring the combinations into which it enters ; 

 difcovered by Klaproth in the red lead of Sibe- 

 ria. Vauquelin has made many experiments up- 

 on this fubftancc, but it's place in mineralogy is 

 not yet fully eftablifhed. 



X. TELLURIUM. 



Klaproth has chemically analyzed the aurifer- 

 ous mine, known as the mine of white gold (Weife 

 goldertz) aurum paradoxum, metallum vel aurum 

 problematieum ; found in the mine called Maria- 

 lulf, in the mountain of Fatzbay near Zalethna, 

 in Trarifylvania ; and in this mineral has found a 

 metal different from every other yet known. 



It is of a whitifh greyifh colour; friable and 

 lamellar ; in cooling after being heated, it takes a 

 cryftallized furface ; very hard of fufion. Placed 

 on a heated body, it burns with a bright flame, of 

 a blue colour; it amalgamates with mercury. 



■ W --It's 



