24 < 
saloon, which several varieties are known under differ- 
Nat. Hist, ent names, such as the vitreous scapolite, the 
compact and the common scapolite (called also 
iscernerite , after the late illustrious professor of 
Freiberg); the talc-like scapolite (micarelle of 
some authors), &c. ; the bergmannite and the 
fettstein of Werner are related to these.—Distinct 
from these is the sodalite , from Greenland, and a 
new concomitant substance, the eudialyte of 
Stromeyer, composed chiefly of silica, zirconia, 
and soda.—In this table-case also begins the suite 
of specimens of feldspar , which is continued in 
the next case ; specimens of compact feldspar, 
among which are, the red variety from Sweden, 
frequently mistaken for hornstone ; the weiss - 
stein of Werner; the feldspath compacte tenace 
of Haiiy, which is the same as the jade of Saus- 
sure, called by some saussurite, &c. 
(Case 12.) In this glass-case are deposited the 
different varieties of the Labrador feldspar , the 
nakerfeldspar, or adularia, and the common t feld¬ 
spar, .—Among the specimens Labrador feldspar 
(more properly called opalescent feldspar, being 
remarkable for the beautiful play of colours which 
it exhibits) are several from the transition syenite 
of Laurwig in Norway.—The adularia (which 
stands in the same relation to common feldspar, 
as rock crystal to common quartz) is principally 
found on Mount St. Gothard, but not in the valley 
of Adula, from which its name is improperly de¬ 
rived :—-this variety when cut en eabochon (such 
as 
