gallery.] natural history. 121 
drite, cube-spar and muriacite, crystalline, fibrous, granular 
and compact; to the last of which belong some of the 
Italian varieties known by the name of bardiglio and bar- 
diglione, as also the singular fibrous-compact variety fami¬ 
liarly called tripe-stone (pierre des trippes), from the salt 
mines of Wieliczka. 
Case 58. Sulphates continued:— sulphate of magnesia, 
generally occurring in crystalline fibres: the fine variety 
from Calatayud in Arragon; also the haar-saltz (capillary 
salt) of Idria belongs to this species, and the stalactic co¬ 
balt-vitriol, as it is called, from Herrengrund in Hungary, 
is only sulphate of Magnesia, coloured red by oxide of co¬ 
balt.— Poly halite, a chemical compound of several sul¬ 
phates, formerly mistaken for anhydrous sulphate of lime: 
compact and fibrous, from the salt formation of Berchtes- 
gaden in Bavaria, and Ischel in Austria.— Sulphate of 
zinc , white or zinc vitriol.—Sulphate of iron, or green 
vitriol, (a salt mostly produced by the decomposition of 
iron pyrites,) in beautiful large rhombohedral crystals, from 
Bodenmais in Bavaria, and massive, and in stalactic- 
Sbrous forms, such as the specimens from the Rammels- 
berg, in the Hartz, where it also occurs in the form of 
yellow scales, known by the name of tnisy ; and as concre¬ 
tions of a red colour, called vitriol-roth 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, or lead vitriol, 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, and sulphato-tricarbonate of 
lead, 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 sub¬ 
sulphate of alumina , called aluminiie, or rvebsterite, from 
Sussex and from Halle in the territory of Magdeburg, 
