SALOON. 
Nat. Hist. 
24 
ner; the feldspath compacte tenace of Haiiy, 
which is the same as the jade of Saussure^ call¬ 
ed by some saussurite, &c. 
Case 12 . In this glass-case are deposited the 
different varieties of the Labrador feldspar^ the 
naker-feldspar^ or adularia, and the common feld¬ 
spar, —Among the specimens of Labrador feld¬ 
spar (more properly called opalescent feldspar, 
being remarkable for the beautiful play of co¬ 
lours 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. Go- 
thard, but not in the valley of Adula, from 
which its name is incorrectly derived : this va¬ 
riety when cut en cabochon^ (see Room I. Table 
5.) is commonly called moon-stone ; modifica¬ 
tions of crystals of this variety.— Common feld¬ 
spar^ variously crystallized and massive, among 
the latter of which may be particularized the 
fine green variety from Siberia, called amazon- 
stone ; feldspar with imbedded fragments of 
quartz (graphic stone) from Siberia, &c,—To 
these are added a few specimens of disintegra¬ 
ted feldspar, which passes into porcelain earth. 
—The chiastolite or made, placed in this table, 
is referred by Werner to feldspar, under the 
name of hollow ^^2iV,—Icespar, — Fetalite and 
spodumen or triphane, substances in which lithi¬ 
um. 
