GALLERY.] NATURAL HISTORY. • 107 
from Auvergne, Faroe, &c., to which are also referred the 
natrolite of Klaproth, the needle-stone of Werner, the 
scolicite , the mesolite, krokalite, &c. ;— thomsonite ; — anal - 
cime, among the crystallized varieties of^vhich are re¬ 
markably large specimens of the trapezoidal and triepointe 
modifications from Fassa in Tyrol. 
Case 28. Zeolitic substances continued; stilbite and 
heulandite ; — 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 emerald;—to this also belongs 
the koupholite of Vauquelin. The substance known by 
the name of Chinese jade or yon-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 arid 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 naker feldspar, 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 cabochon, is called moon-stone ; 
and a yellow naker feldspar with reddish dots has obtained 
