GALLERY. ] 
NATURAL HISTORY. (Minerals.) 79 
generally occurring in crystalline fibres : the fine variety form Calatavud 
in Arragon ; also the hacir salz (capillary salt) of Idria belongs 1»> thh 
species, and the stalactic cobalt- vitriol, as it is called, from f lerremrruml 
in Hungary, which is only sulphate of magnesia, coloured red by oxide 
of cobalt. — - Polyhalite, a chemical compound of several sulphates, 
formerly mistaken for anhydrous sulphate of lime : compact and fibrous! 
from the salt formation of Berchtesgaden in Bavaria, and Ischel in 
Austria. — Sulphate of zinc , white vitriol ox galUtzinite Sulphate of 
iron, green vitriol, or melantherite , (a salt mostly produced by the de- 
composition of iron pyrites,) in beautiful large rhombohedral crystals, 
from Bodenmais in Bavaria, and massive, and in stalactic-fibrous forms,' 
such as the specimens from the Rammelsberg, in the Hartz, where it 
also occurs in the form of yellow scales, known by the name of misy ; 
and as concretions of a red colour, called vitriol-roth or hotryogene : 
the plumose vitriol (^federsalz ), and a bofryoidal-reniform substance 
called bergbutter, are nothing but casual mixtures of sulphate of iron and 
hydrous sulphate of alumina . — Sulphate of copper , or copper 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 Herrengmmd in Hungary. There are also two or 
three scarce Siberian mineral substances placed in this Case (one of 
them, the brochantite ), which appear to be sub-sulphates of copper, but 
stand in need of more accurate chemical examination . — Sulphate 
of uranium oxide or johannite, a very rare mineral substance, from Joa- 
chimsthal, Bohemia . — 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 An- 
glesea, &c. ; the sulphato-carbonate ( lanarkite ), and sulphato-tricar- 
bonate ( suzannite ), the cupreous sulphato-carbonate ( caledonite ) of 
lead, &c. , from Leadhills, &c . — 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, 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 , (alunite of 
some mineralogists,) from Tolfa, &c., which is a basic sulphate of alu- 
mina and potassa. 
In this Case are also placed some specimens of lazulite, or lapis 
lazuli (which furnishes the valuable pigment called ultra-marine); 
— the hailyne, and a few other of the imperfectly known silicates of 
soda, lime, and alumina combined with sulphates. 
Case 56. Arsenious acid and arseniates : the former (also called 
arsenic-bloom, or octahedral oxide of arsenic) is frequently confounded 
with arseniate of lime, and the white octahedral crystals of it, often seen in 
collections on realgar and orpiment, are generally artificially produced in 
the interior of mines. — The arseniates in this glass Case are : — arseniate 
of lime, called pharmacolite, chiefly in white acicular crystals, from Wit- 
tichen in Suabia, and Riegelsdorf in Hessia . — Arseniate of iron or phar- 
macosiderite, which occurs only crystallized, chiefly in cubes (whence Wer- 
ner’s name of Wiirfel-ertz), from Cornwall, from San- Antonio- Pereira, 
Brazil, on hydrous oxide of iron, & c. ; — skoroditc, a substance which 
