NATURAL HISTORY. 
187 
GALLERY.] 
Case 49. Werner’s brown-spar, some of the varieties 
of which are with difficulty distinguishable from rhomb- 
spar and from iron-spar ; several interesting specimens for 
figure, colour and lustre, are deposited in this case.— 
Carbonate of iron, or iron-spar, crystallized, fibrous, mas¬ 
sive, and botryoidal ( sphrerosiderite of Hausmann).— 
Carbonate of manganese, in globular and botryoidal 
shapes of various shades of rose colour, on sulphuret of 
manganese, &c. 
Case 50. One half of this glass Case is occupied by 
the several varieties of carbonate of zinc, (also called cala¬ 
mine, in common with the silicate of zinc in Case 26,) 
crystallized, botryoidal, and in other forms, among which 
are the pseudomorphous crystals, derived from modifi¬ 
cations of carbonate of lime. The other half contains 
the carbonates of lead, or lead-spar, among which are 
the delicately acicular varieties from the Hartz, and from 
Cornwall, accompanied and partly coloured by green car¬ 
bonate of copper; the crystallized varieties from Siberia, 
Mies in Bohemia; the pulverulent variety, &c. 
Case 51. In this and the following Case are deposited the 
carbonates of copper, viz. the blue copper, or copper-azure, 
the more remarkable varieties of which are those from 
Chessy, and from the Bannat, combined with various sub¬ 
stances ;—the earthy varieties, some of which have been 
used as pigments under the name of mountain-blue;— 
those crystallized varieties which, passing from the state 
of blue into that of green carbonate, have, by Haiiy, been 
called cuivre carbonate epigene. 
Case 52. The green carbonates of copper, among 
which may be specified the fine and rare varieties of 
fibrous malachite, in acicular crystals, and massive with 
fibrous structure and velvety appearance, accompanied by 
carbonate of lead, &c.; and, among the specimens of com¬ 
pact malachite, those characteristic and splendid ones from 
the Gumashevsk and Turja mines, in the Uralian moun¬ 
tains. 
Case 53. 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, often seen in collections, on 
