C 161 3 



U. SYLVANITE. 



This femi-metal, difcovered by Facebay, is 8if- 

 ferent from all other known metallic fubftances 5 

 and is called Sylvanite from it's being found in 

 Tranfylvania ; of a metallic luftre ; fra&ure broad, 

 or granularly imbedded ; of a dark-grey or white 

 colour ; refembles regulus of antimony, or ful- 

 phurated bifmuth ; evaporates by continued heat ; 

 amalgamates with mercury by fimple trituration ; 

 and detonates with nitre ; foluble in aqua regia* 

 and in concentrated vitriolic acid in cold, or a low 

 digefting heat, and the folution is crimfon red; but 

 by the affufion of water, or by a ftrong heat it is 

 precipitated. Muller found it to contain a fmall 

 proportion of arfenic and of nickel, and alfo of 

 gold. Bergman found it to contain a little zinc ; 

 but thefe mixtures feem to be merely cafual. 

 Kir wan, 



V. TITANITE. 



A femi-metal, difcovered by Klaproth, found at 

 Rhonitz, and at Bainick in Hungary ; of a brown- 

 ifh-red colour ; fracture foliated, unequal and 

 conchoidal ; cryftallized in right-angled quadran- 

 gular prifms, longitudinally ftreaked and furrow- 

 ed, often acicular, and feated on fchiftofe mica 

 alternating with quartz. Expofed to a moderate 

 heat, it remains unaltered, but in a cool crucible 

 it burfts into angular fragments, lofes it's luftre 

 and colour, and becomes pale brown ; infoluble 

 in aqua regia, vitriolic, nitrous, or marine acid. 



Y a. Calcareo 



