GALLERY.] natural history. (Minerals.) Go 
Red oxide of zinc , also called zinkite, spartalile and slcrlingite , from 
Sparta m New Jersey; to which is added, from the same locality, the 
franklmite, a mineral composed of the oxides of zinc and manganese. 
— Black and yellow earthy cohalt , both called cohalt-ochre , which seem 
to be hydrates of the oxides of cobalt and manganese, frequently 
mixed with oxide of iron. — Oxide of uranium, or uran-ochre , occurring 
at Johanngeorgenstadt and Joachimsthal, together with what is called 
pilch- ore, considered by some as a hydrous protoxide of the same 
metal ; which, however, requires further confirmation. 
Case 18. Oxide of lead : — the native minium from Hessia (first 
described by Mr. Smithson), from Siberia, &c., probably produced 
by the decomposition of galena;-— with this is placed the heudantite, 
a mineral from Horhausen on the Rhine, which, according to Wol- 
laston, consists only of the oxides of lead and iron : (M.M. Damour 
and Descloiseaux, however, consider Levy’s beudantite as identical 
with Werner’s wiirfelerz or arseniate of iron.) — Oxide of tin or tin- 
stone, divided by Werner into common tin-stone and wood-tin : among 
the specimens of the former (chiefly from Cornwall, Saxony, and 
Bohemia) may be specified the greyish-white crystals resembling 
scheel-ore or tungstate of lime, the regular and macled crystals, the 
pebble-like and granular tin-stone (shoad-tin, stream-tin, grain-tin, &c. ), 
the columbiferous oxide of tin from Finbo in Sweden -among the 
varieties of wood-tin, are some composed of radiated-fibrous small 
globules, others marked with concentrically disposed, brown and yellow 
colours, and called toad’s eye wood-tin, fortification wood-tin, &c. To 
which are added some specimens of metallic tin, the result of smelting, 
of which the more remarkable, on account of its locality, is that cast 
in the form of thick wires, brought by Capt. Clapperton from Soudan 
in Africa, and mentioned in the Appendix to his Journal. 
In the next Case begin the oxides of electro-negative bodies, and 
their various combinations. 
Case 19. Alumina and Aluminates. To the former belongs the 
corundite, divided into nohle and common corundite, the former com- 
prehending the precious stones commonly called oriental gems (the 
sapphire, ruby, oriental amethyst, oriental topaz, oriental emerald), of 
the crystallized forms of which the principal modifications are here 
deposited; the latter, to which the name of corundum is more espe- 
cially applied, affords one of the hardest and best polishing materials 
to the lapidary : from Bengal, Mysore, China, the Carnatic (Werner’s 
diamond spar), Lapland, Piedmont, &c. As appendix to these are 
added, the emery, a substance which derives its hardness and consequent 
usefulness for polishing to an admixture of blue or grey corundum ; 
and the indianite of Bournon, which sometimes occurs as matrix of the 
common corundum of the Carnatic. 
As hydrates of alumina are to be particularized, the diaspore from the 
Ural, and the gibhsite from Massachusetts, together with the hydrargillite 
of Rose (not of Davy), from Lissensko, in the Shisshimskian moun- 
tains.- — With these is also placed the hydromagnesite . 
Aluminate of magnesia — the spinel : Q among its principal varieties may 
be specified the blue spinel of Aker in Siidermannia; the brown, 
often found in crystals of considerable dimension, from New Jersey; 
and the chlorospinel of Rose, in which a portion of the alumina is 
