62 NATURAL HJSTORY. [NORTH 
lustre (which has obtained for the former the appellation of satin-spar), 
and that in coloured layers from Africa. 
Cases 45 A. and 45 B, are set apart for polished specimens of such 
granular, compact and fibrous varieties of calcite as are familiarly known 
by the appellation of marbles , and of those that bear the name of ala¬ 
baster in common with the finer varieties of sulphate of lime. Among 
the varieties of shell limestone in Table Case A., the most esteemed 
for ornamental purposes is the Carinthian lumachella, or fire marble. 
Case 46 contains the remaining varieties of calcite, among which 
may be particularized the well-known depositions from the hot springs 
of Carlsbad in Bohemia, particularly the pisiform limestone, or 
pea stone , as also the globular variety (considered by some as 
magnesian limestone) found in the bed of a small river near Tivoli, 
and known by the name of Confetti di Tivoli,—the tufaceous lime¬ 
stone , in porous, spongy, cellular, tubular and other imitative forms, 
as incrustation on various objects, such as on the human skull here de¬ 
posited, which was found in the Tiber at Rome ; calcareous deposition 
formed in a square pipe in a coal mine in Somersetshire ; casts made at 
the baths of San Felippe, where moulds of medals, gems, &c., are placed 
in suitable situations to receive the spray impregnated with calcareous 
particles.— Chalk.—Anthraconite or madreporite. — Marie, &c. 
Case 47. In this Case, besides some specimens of carbonate of mag¬ 
nesia , or magnesite , from Baudissero and from New 7 Jersey, are placed 
those substances which, being chiefly composed of carbonate of lime 
and carbonate of magnesia, are called magnesian limestone, or dolomite, 
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 vhth difficulty distinguishable from rhomb-spar and from iron- 
spar ; several interesting specimens for figure, colour and lustre, chiefly 
from Schemnitz and Kremnitz in Hungary, are deposited in this case. 
— Carbonate of iron, oriron-spa) \ crystallized, fibrous, massive, and bo- 
tryoidal ( sphcerosiderite 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, &c. 
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, &c. ; —the pulveru¬ 
lent 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- 
