124 
NATURAL HISTORY. 
[[long 
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.— PolylwMte , 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 rhomboidal crystals, from 
Bodenmais in Bavaria, and massive, and in stalactic- 
fibrous 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 misy ; 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 aluminite , or websterite, from 
Sussex and from Halle in the territory of Magdeburg, 
