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GALLERY.] NATURAL HISTORY. 173 
baryta or witherite, among the specimens of which may be particularised 
the beautiful groups of double six-sided pyramids, and those of six- 
sided prismatic crystals.— Barytocalcite, from Alston Moor in Cumber¬ 
land. 
Case 42. Carbonate of lime. The whole of this Case is appropriated 
to the species called arragonite, among the principal specimens of which 
are the groups of prismatic crystals from Kosel, Bohemia, Arragon, &c.; 
those of the coralloid variety of this substance from Eisenertz in Stiria, 
formerly called flosferri, &c. To the massive varieties some of the 
calcareous deposits of Carlsbad in Bohemia may be referred. In the 
next six Table Cases are deposited the different sub-species or varieties 
of common carbonate of lime or calcite. 
Cases 43 and 44. Crystallized varieties of calcite (calcareous spar). 
Among the specimens in the first of these Table Cases may be specified 
those illustrative of their double refraction, cleavage, supernumerary] oints, 
colour, &c.; likewise the various secondary obtuse and acute rhombo- 
hedrons; among the former of which the most common, but not the least 
striking, is the inverse variety of Haiiy, so called from its being as it 
were an inversion of the primitive rhombohedron of calcareous spar; 
and the same with a considerable admixture of quartz, commonly called 
crystallized sandstone of Fontainbleau, &c.; also many interesting and 
beautiful specimens, from the Hartz, Derbyshire, &c., of prismatic and 
pyramidal modifications of the same substance. 
Case 45, besides additional chiefly prismatic varieties of crystallized 
calcite, contains several belonging to the stalactic and fibrous varieties 
of that substance, the most beautiful modifications of which latter are 
those from Cumberland and Sweden, with pearly lustre (which has ob¬ 
tained 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 w r hich 
may be specified 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, Sec. 
Case 47. In this Case, besides some specimens of carbonate of mag¬ 
nesia, or magnesite, from Baudissero and from New Jersey, are placed 
those substances which, being chiefly composed of carbonate of lime 
and carbonate of magnesia, are called magnesian limestone, or dolomite, 
