GALLERY.] NATURAL HISTORY. 107 
from Auvergne^, Faroe, &c., to which are also referred the 
natrolite of Klaproth, the needle-stone of Werner, the 
scolicites the mesolite, Icrokalite, &c. 5 — thomsonite ; — anal- 
cime^ among the crystallized varieties of which are re¬ 
markably large specimens of the trapezoidal and triepointe 
modifications from Fassa in Tyrol. 
Case 28. Zeolitic substances continued; stilbite and 
heulandile ; — brewsterite;—laumontite or lomonite, also 
called efflorescent zeolite, because some of its varieties are 
subject to decomposition by exposure to the air;— prehnite, 
the grass-green variety of which, discovered in South 
Africa by the Abbe Rochon, has been mistaken for chryso¬ 
lite, chrysoprase, and even emeraldto this also belongs 
the koupholite of Vauquelin. The substance known by 
the name of Chinese jade or you-stone, 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.—A suite of specimens of comptonite from Vesuvius, 
lining the cavities of a pyroxenic lava, &c., accompanied 
by gismondine and other crystallized substances;— gmeli- 
nite or hydrolite ; — levine, and some other new species of 
this extensive family of minerals. 
Case 29. To the same family belongs the harmotome 
or cross stone, 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. 
The remainder of this Case is occupied by species of the 
feldspar family,— Common feldspar, variously crystallized 
and massive: among the specimens here deposited may be 
specified—the fine green variety from Siberia, called ama¬ 
zon stone; the beautiful large crystals from Baveno ; feld¬ 
spar with embedded crystals and fragments of quartz (gra¬ 
phic stone, graphic granite), from Siberia, &c.;— Labra¬ 
dor feldspar (also called opalescent feldspar, being remark¬ 
able for its beautiful play of colours), chiefly from the 
coast of Labrador and from the transition syenite of Laur- 
wigin Norway;— adularia or nakerfeldspar, principally 
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 cahochon, is called moon-stone ; 
^nd a yellow naker feldspar with reddish dots has obtained 
