145 
Case 27. Zeolitic substances continued: stiU 
bite and heulandite ;—hrewsterile ;—laumontite 
or lomonite, also called efflorescent zeolite, 
because some of its varieties are apt to decom¬ 
pose by exposure to the air ;— prehnite, the 
grass-green variety of which, discovered in South 
Africa by the Abbe Rochon, 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 stone you , is likewise placed with preh- 
nite, 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 gismond- 
ine and other crystallized substances;— gmelinite 
or hydrolite ;—levine , and some other new spe¬ 
cies of this extensive family of minerals. 
Case 28. To the same family belongs the liar* 
motome or cross stone, divided into baryte-har- 
motomeand potas-harmotome, to which latter are 
to be referred the Vesuvian minerals called zeago- 
nite , gismondine, abrazite , and also the philipsite. 
The remainder of this glass-case is occupied 
by the 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 amazon stone ; the beautiful large crystals 
l from 
LONG 
GALLERY. 
