NATURAL HISTORY. 
57 
GALLERY.] 
has been mistaken for chrysolite, chrysoprase,and even emerald;—to this 
also belongs the koupholite of Vauquelin. The substance known by the 
name of Chinese jade or you-stone, (kyonk tshein of the Burmese,) is 
likewise placed with prehnite, to which it has been referred by Count 
Bournon; but no chemical analysis has as yet been given of it. 
(Among the vessels wrought out of it on this table is a cup, the 
gift of the king of Ava to Lieut.-Col. Burney when British Resi¬ 
dent at that court, and by him presented”to the British Museum.)—A 
suite of specimens of comptonite from Vesuvius, lining the cavities of a 
pyroxenic lava, &c., accompanied by gismondine and other crystallized 
substances ; and the thomsonite, which is supposed to be a variety of 
this species^TweZm/^e or hydrolite; — levine, and some other new 
species of this extensive family of minerals. 
Case 29. To the same order belongs the harmotome or cross stone, 
also called andreolite, after Andreasberg, in the Hartz, where it was 
first discovered, divided into baryte-harmotome and potass-harmotome, 
to which latter are to be referred the Vesuvian minerals called zeagonite, 
gismondine, abrazite, and also the philipsite. Of andreolite, a magnifi¬ 
cent specimen is deposited, presented by King George IV. 
The remainder of this Case is occupied by species of feldspathic sub¬ 
stances. — Commonfeldspar, variouslycrystallizedandmassive ; amongthe 
specimens here deposited may be particularized—the fine green variety 
from Siberia, called amazon stone ; the beautiful large crystals from 
Baveno ; feldspar with embedded crystals and fragments of quartz (gra¬ 
phic stone, graphic granite), from Siberia, &c.;— Labrador feldspar 
(also called opalescent feldspar, from its often exhibiting a beautiful play 
of colours in cut and polished specimens, of which a pretty complete 
suite is added,) chiefly from the coast of Labrador and from the transi¬ 
tion syenite of Laurwig in Norway;— adularia or naher feldspar, princi¬ 
pally found on mount St. Gothard, but not in the valley of Adula from 
which its name is derived ; the fine variety from Ceylon, when cut 
en ca6ocAon, is called moon-stone; andayellownaker feldspar with reddish 
dots has obtained the name of sun-stone, which is also sometimes given 
to the beautiful avanturino variety of common feldspar placed in this 
glass-case. 
Case 30. Feldspathic substances continued ;— ice-spar and sanidine 
or glassy feldspar, both nearly allied to common feldspar ; albite or 
cleavelandite, the finest specimens of which are those from Dauphine 
and Siberia ; and pericline, united by some mineralogists with the pre¬ 
ceding species, from St. Gothard, Tyrol, &c. ;— anorthitc irom Vesu¬ 
vius ;— oligoclase, also called natron-spodumen—together with some 
other species separated, perhaps unnecessarily, from common feldspar 
and cleavelandite_Besides these we have the leucite or amphigene, 
chiefly from Vesuvius, in separate crystals of various sizes and degrees 
of transparency, massive, embedded in pyroxenic and other lavas;— 
triphane or spodamen and petalite: in which latter substance lithia, or 
the oxide of lithium, was first discovered by Arfvedson, &c. 
Case 31. This Case contains— nephcline, from Mount Ve.suvius, 
with wLich are now combined the davyne of IMontcelli and several 
varieties of the elceolite or fettstein of Werner ;— wernerite, under which 
name, formerly confined to some varieties of common and compact 
scapolite, are now by most mineralogical writers united the meioniie 
D 3 
