NATURAL HISTORY. 
118 
[long 
pyramids, andjdiose of six-sided prismatic crystals.— Ba - 
rytocalcite. 
Case 42. Carbonate of lime. The whole of this glass 
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 Eisen- 
ertz in Stiria, formerly called flos ferri y &c. To the 
massive varieties some of the calcareous deposits of Carls¬ 
bad in Bohemia may be referred. 
Cases 43, 44, and 45 contain the crystallized varieties 
of carbonate of lime or calcareous spar. Amongthe speci¬ 
mens in Case 43 may be specified those illustrative of the 
double refraction, cleavage, supernumerary joints, colour, 
&c.; likewise the various secondary obtuse and acute 
rhombohedrons ; among the former of which the most 
common, but not the least striking, is the inverse variety 
of Hally, 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 Fontainebleau, &c. In the 
next two Cases are deposited many interesting and beautiful 
specimens, from the Hartz, Derbyshire, &c., of prismatic 
and pyramidal modifications of the same substance. 
Case 46 contains various specimens of stalactic lime¬ 
stone, some varieties of which (such as those here deposited 
from Egypt, Shir Amin in Persia, &c.) bear the name of 
alabaster in common with the finer varieties of gypsum, 
and have, by Werner and other mineralogists, been re¬ 
ferred to fibrous limestone; the most beautiful modifica¬ 
tions of which latter are those from Cumberland and Swe¬ 
den, with pearly lustre (which has obtained for the former 
the appellation of satin-spar), and that in coloured layers 
.from Africa. Also some specimens of granular limestone 
(granular marble) are placed in this Case. 
Case 47 is set apart for such compact varieties of lime¬ 
stone as are generally called Marbles ; for the present it 
only contains some varieties of shell limestone , the most 
esteemed of which, for ornamental purposes, is that from 
Carinthia, called lumachella or fire marble. 
Case 48 contains the remaining varieties of carbonate 
of lime, among which may be specified the well-known 
