SALOON. 
Nat. Hist. 
22 
beria: the variously-tinted common jasper; the 
agate jasper, found only in agate veins; the porce¬ 
lain jasper , which is produced by the action of 
subterraneous fire on clay-slate. Also the sub¬ 
stances constituting the obsidian tribe, such as the 
pitcli-stone , which is often confounded with semi¬ 
opal;—the pearl-stone , so called from its colour 
and the small globular concretions of which it is 
composed ;—the obsidian , a remarkable variety 
of which is that found in globular pieces, at Oc- 
chotsk in Siberia, near the small river Marekanka, 
from which it has obtained the name of Mareka- 
nite ; pumice , which is not in all cases of volcanic 
origin. Near these substances are placed some 
specimens of the mineral called by some iolite and 
pelioma , and dichroite from its exhibiting two dif¬ 
ferent colours when viewed in different positions ; 
together with the blue quartz from Orayervi in 
Finland, called also steinheilite . 
(Case 10.) This case contains zeolitic sub¬ 
stances, viz, several varieties of scolicite and of ^ 
mesotype , among the specimens of which may be 
particularized those with perfect prismatic-acicu- 
lar crystals {needle-stone of Werner); the delicate¬ 
ly fibrous varieties ; the red compact variety, by 
some called crocalite, &c.—Th enatrolite of Klap¬ 
roth, of which a few specimens are added, is by 
some considered as a variety of mesotype.— 
Stilbite , mostly crystallized : among the colour¬ 
ed varieties is the red from Fassa (Fassait). 
—Apophyllitej some varieties of which have 
been 
