GALLERY.] NATURAL HISTORY. 181 
tions of a red colour, called vitriol-rotk or botryogene: the 
plumose vitriol (federsalz), and a botryoidal-reniform sub¬ 
stance called bergbutter, are nothing but casual mixtures of 
sulphate of iron and hydrous sulphate of alumina.— Sul¬ 
phate of cobalt.—Sulphate of copper or blue vitriol: — 
the finest sky-blue specimens here deposited, together with 
the stalactic, fibrous and crystallized varieties, (the large 
group of crystals is artificially prepared,) are from Herren- 
grund in Hungary. There are also two or three sub-sul¬ 
phates of copper placed in this Case, which, however, stand 
in need of more accurate chemical examination.— Sulphate 
of lead, lead-vitriol , or anglesite , of which we have a suite 
of specimens with brilliant and well defined crystals from 
Badenweiler in Suabia, from the Parys mine in Anglesea, 
&c.; the sulphato-carbonate (lanarkite ), and sulphato- 
tricarbonate (suzannite ), the cupreous sulphato carbonate 
(caledonite ) of lead, &c., from Leadhills, &c. The rest of this 
Case is occupied by sulphates of alumina common alum, 
crystallized, fibrous, &c., from various places ; and the 
hydrous subsulphate of alumina , called alumhiite, or web- 
sterite, from Sussex and from Halle in the territory of 
Magdeburg, which was by some mistaken for pure alumina, 
and by others for hydrate of alumina with mechanically 
admixed sulphate of lime : it must not be confounded with 
another substance also called aluminite or alum-stone (alu- 
nite of some mineralogists,) from Tolfa, &c., which is a 
basic sulphate of alumina and potassa. 
Case 59 contains the fluorides, of which by far the most 
important species is the fluoride of calcium, generally 
called fluate of lime and fluor-spar : among its numerous 
varieties may be particularized, the rose-coloured crystals 
from Chamouni; the phosphorescent massive fluor-spar, 
called chlorophane, from Siberia ; the varieties called forti- 
fication-fluor; earthy and compact fluor, &c., chiefly from 
Derbyshire and Saxony.— Fluoride of calcium yttrium and 
cerium;—yttrocerite; and some related minerals from 
Finbo and Brodbo near Fahlun in Sweden. Fluoride of 
sodium and aluminum, called cryolite, found in West 
Greenland : pure and mixed with brown iron stone, 
galena, &c. 
Case 60 contains the chlorides.—Chloride of sodium 
( muriate of soda), or rock salt: the most interesting speci¬ 
mens here deposited of this important mineral substance, 
