NATURAL HISTORY. 
174 
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[north 
comprising Werner’s rhomb-spar, dolomite and brown spar. Among 
the varieties of the first of these sub-species are those called miemite , tha - 
randite, and some modifications of pearl spar ; among those of dolo¬ 
mite, a remarkable one is that from Pittsfield, Massachusetts, North 
America, which exhibits a considerable degree of flexibility: and an¬ 
other having the same property will be found among the singular va¬ 
rieties of magnesian limestone from the vicinity of Sunderland. 
Case 48 contains 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 de¬ 
posited in this pase. — Carbonate of iron, or iron-spar, crystallized, fibrous, 
massive, and botryoida! (splicerosiderite of Hausmann).— Carbonate 
of manganese, or manganese spar, crystallized and in globular and 
botryoidal shapes of various shades of rose colour, on sulphuret of 
manganese, &e. 
Case 49. One half of this glass Case is occupied by the several 
varieties of carbonate of zinc, or zink-spar, (also called calamine, in 
common with the silicate of zinc in Case 26,) crystallized, botryoidal, 
and in other forms, among which are the pseudomorphous crystals, de¬ 
rived from modifications of carbonate of lime.—The other half contains 
the carbonates of lead, lead-spar, or white lead ore , among which are 
the delicately acicular varieties from the Hartz, and from Cornwall, 
accompanied and partly coloured by green carbonate of copper; the 
crystallized varieties from Siberia, Mies in Bohemia; the pulverulent 
variety, &c. 
Case 50. In this and the following Case are deposited the car¬ 
bonates of copper, viz. the blue copper, or copper-azure, the more re¬ 
markable varieties of which are those from Chessy, and from the Ban- 
nat, combined with various substances;—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. f 
Case 51. The green carbonates of copper, among which may be 
specified the fine and rare varieties oifibrous malachite, in acicular crystals, 
and massive with fibrous structure and velvety appearance, accompanied 
by carbonate of lead, &c. ; and, among the specimens of compact mala¬ 
chite, those characteristic and splendid ones from the Gumashevsk and 
Turja mines, in the Uralian mountains. 
Case 52. 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 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. ;— shorodite, a substance wffiich 
appears to be closely allied to Bournon’s martial arseniate of copper.— 
Arseniates of copper, consisting of the foliated arseniate or copper-mica , 
the lenticular arseniate or lentil-ore, and the olive-ore of Werner, which 
