C 44 3 
97. Moiybd^num. 
98. Uranium. 
99. Ti TANIUM. 
100. Chromium. 
lOI. COLUMBIUM. 
102. Tantalium. 
Iron-grey, brittle, compofed of fcaly parti- 
cles; melting with great difficulty, gradu- 
ally becoming a white volatile oxyde when 
heated, which with the addition of bora* 
is reducible to a violet glafs: fpecific gra- 
vity 7,500. 
Dark-grey inclining internally to brown, 
foft, opake, melting with extreme difficul- 
ty; convertible into a yellow powder by 
means of the nitric acid: fpecific gravity 
6,440. 
Orange red, very hard, in minute aggluti- 
nated grains; not fiifible by any known 
heat, forming a blue or purple oxyde when 
heated: fpecific gravity . 
White with a lhade of yellow, very brittle; 
melting with difficulty, dilTolving flowly 
in acids ; gradually becoming a green ox- 
yde when heated in a clofevefiel; fpecific 
gravity . 
Dark brown-grey, hardifli, very bittle, of 
an imperfeftly lamellar texture ; yielding 
when pounded a dark chocolate-browR 
powder which is not attracted by the mag- 
net; yielding a black powdery oxyde when 
expofed to a very violent heat: fpecific 
gravity 5,918- 
Blackifh grey, foftifh, of a granular frac- 
ture, not foluble in any acid, nor altering 
its colour when heated to redncfs ; yield- 
ing a white powdery oxyde; fpecific gra- 
X‘.*y S.J30- 
