50 
23ALOON. 
N-at. Hist. 
occupied by the ores of manganese, viz.— oxides : 
radiated grey manganese, some varieties of which 
resemble the radiated antimony in the disposition 
of their acicular crystals ; foliated grey manganese, 
compact grey manganese of various forms, botry- 
oidal, tubercular, reniform, &c.; earthy grey man¬ 
ganese, a remarkable variety of which is the black 
wad of Derbyshire and Devonshire, which has the 
property of inflaming spontaneously when mixed 
with linseed oil.— Silicates of manganese: the red 
compact varieties from Siberia (Werner’s mangan- 
spath), and from Kapnik (the red manganese of 
the same mineralogist).— Carbonate of manganese, 
phosphate, &c.—The helvine, referred by some 
mineralogists to Bournon’s crichtonite, from which, 
however, it appears essentially to differ. 
In this case are also placed the ores of colum- 
bium or tantalum, of yttria and of cerium, &c.— 
Columbite :—the specimen from North America in 
which Hatchett discovered the metal (see Phil. 
Trans. 1802,) yttriferous columbite or yttrotan- 
talite, from Bavaria, &c.—Silicate of yttrium : 
gadolinite, of which a unique crystal is here depo¬ 
sited : pyrorthite and orthite, two newly discovered 
Swedish minerals, related to gadolinite.— Cerite 
or cerine (silicate of cerium) from Bastnaes in 
Sweden.— Yttrocente, a fluate of lime, yttria and 
{cerium; and a related mineral composed of 
Huate of yttria and oxide of cerium, with only a 
small 
