58 
NATURAL DISTORT. 
[north 
embedded in lava from Vesuvius, together with groups of well-de¬ 
fined crystals from Arendahl in Norway, where this substance occurs in 
primitive rocks;—the jeffersonite ;—the granular variety called coccolite; 
—the varieties of diopside , at first considered as a distinct species, in¬ 
cluding the mussite and alalite from Piedmontthe sahlite or malaco- 
lite, 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, 
Salzburg, &c., the bronzite and the hypersthene or paulite (Labrador 
hornblende of Werner), may likewise be referred to this order of 
minerals. 
Case 35. Among its contents may be particularized the mineral sub¬ 
stances which have been described under the appellations of thallite, 
arendalite, acanticone, delphinite, &c. ; most of these are Werner’s pis- 
tacite 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.— Cummingtonite .—- 
Zoisite _Among the specimens of idocrase (vesuvian of Werner), the 
more conspicuous are the large beautiful crystals (the unibinaire of 
Haiiy), discovered by Laxmann on the banks of the Vilui in Kamschatka, 
embedded in a steatitic rock; those from Vesuvius, where this substance 
occurs accompanied by other volcanic ejections, 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 cyprine;—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 vesuvian : most of the hyacinths o£ 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 esta¬ 
blished are: —the chrome-garnets, to which belongs th epyrope; the lime- 
garnets, comprising chiefly the melanite from the vicinity of Frascati, and 
some brownish-black varieties ; the colophonite, so called from its resem¬ 
blance to rosin, from Norway and North America; the grbssular or 
Wilui garnet, a fine light-green species from Kamschatka, so called 
from the fancied resemblance w 7 hich its separate crystals bear to a goose¬ 
berry ; the allochroite, also called splintery garnet, from Drammen, in 
Norway; the romanzovite. In this Case are also deposited—the 
gehlenite , from the Monzoni in Tyrol, to which species the melilite from 
Capo di Bove, near Rome, is referred by some mineralogiststhe 
iolite or pelioma, now generally called dichroite (from its exhibiting 
two different colours when viewed in different positions), massive and 
crystallized, from Capo di Gate, from Greenland, Bodenmais in Bavaria, 
and Orayervi in Finland ( steinheilite );—the sordawalite from Finland; 
—the karpholite from Bohemia, &c. 
Case 37. One half of this Table Case is set apart for the silicates 
containing glucina and alumina, the principal species of 'which is the 
beryl, including the emerald, a gem which owes its beautiful green 
colour to oxide of chromium : the most remarkable specimens of 
emerald are those from Santa Fe, from the Ural, from Heubachthal 
