31 
but not the least striking, is the inverse rhom- saloon. 
bohedron, so called from being as it were an in- Nat. Hist. 
version of the primitive ; the same with a con¬ 
siderable admixture of quartz, commonly called 
crystallized sandstone of Fontainebleau. Pris¬ 
matic andpyramidal modifications of the same, 
among the former of which are the beautiful 
varieties from the Hartz, Salzburg, &c.^' 
Case 21. The same continued: this case 
contains specimens of the lamellated varieties of 
carbonate of lime, called slate-spar and apJirite ; 
tabular spar with garnets and cinnamon stone, 
and some of the Vesuvian varieties of the 
same, to which the name of wollastonite has 
been given by the Cav. Monticelli; granular 
and compact limestone (marbles); massive mag¬ 
nesian limestone, called dolomite^ and (con¬ 
tiguous to it, in the opposite case) the crys¬ 
tallized magnesian limestone, called hitterspar^ 
in chlorite slate; a variety of the same called 
tharandite^ See. —The substances called gurho- 
viaUy from Gurhof in Lower Austria: and co- 
nite^ composed of the carbonates of lime and 
magnesia.— Fibrous limestone., the finest varieties 
of which are those from Cumberland, with pearly 
lustre, which has obtained the name of satin 
spar, and that in coloured layers from the inte¬ 
rior of Africa. 
* For a greater variety of the modifications of crystallized car¬ 
bonate of lime, see the British Collection (Room X.), especially Der¬ 
byshire and Cumberland, 
Case 
