110 
NATURAL HISTORY. 
[long 
groups of well-defined crystals from Arendahl in Norway, 
where this substance occurs in primitive rocks ;—the jef- 
fersonite ; —-the granular variety called coccolite ; —the va¬ 
rieties of diopside, at first considered as a distinct species, 
including the mussite and alalite from Piedmont;—the 
sahlite or malacolite, to which also belongs the baikalite, of 
which a few fine specimens are here deposited; the pyrgome 
or fassaite, and the achmite. The metalloid diallage or 
diallagite, also called schiller-spar, from the Hartz, Salz¬ 
burg, &c., the bronzite and the hypersthene or paulite (La¬ 
brador hornblende of Werner), may likewise be referred 
to this tribe of minerals. 
Case 35. Among its contents may be specified the 
mineral substances which have been described under the 
appellations of thallite, arendalite, acanticone, delphinite, 
&c.; most of these are Werner’s pistacite and are now more 
generally designated by the name of epidote , given to them 
by Haiiy. To this also belongs the manganesiferous epi¬ 
dote, considered by some as an ore of manganese.-- Cummin g- 
tonite. — Zoisite. —Among the specimens of idocrase (vesu- 
vian of Werner), the more conspicuous are the large beau¬ 
tiful crystals (the unibinaire of Haiiy), discovered by 
Laxmann on the banks of the Vilui in Kamschatka, em¬ 
bedded in a steatitic rock ; those from Vesuvius, where 
this substance occurs accompanied by other volcanic ejec¬ 
tions, have, in Italy, obtained the name of Vesuvian gems, 
hyacinths, and chrysolites ; the varieties called egerane , 
loboite, and that from Tellemarken in Norway, coloured 
blue by oxide of copper, and known by the name of cy - 
prine ;—essonite (hessonite ) or cinnamon-stone, chiefly from 
Ceylon, which was supposed to contain zirconia, till a 
more accurate analysis proved it to be nearly allied to vesu¬ 
vian: most of the hyacinths of commerce are cinnamon-stone. 
Case 36. The greater part of this Case is appropriated 
to the various species and varieties of the garnet tribe, 
formerly divided into noble and common garnets. Among 
the more distinct chemical species now established are:— 
the pyrope or chrome garnet, generally called Bohemian 
garnet, which occurs in rounded grains, and also embed¬ 
ded in serpentine, &c.;—the colophonite, so called from 
its resemblance to rosin, from Norway and North America; 
—the melaniie, found particularly in the neighbourhood 
