21 
different varieties or subspecies of jasper, such as 
they are enumerated by V/erner, mz, the globu¬ 
lar or Egyptian jasper^ found chiefly near Cairo, 
in rounded pieces, which appear not to owe their 
form to rolling, but to be original and produced 
by infiltration ; the ribbon jasper, or striped jas¬ 
per, the finest varieties of which are found in Si¬ 
beria; the w 2 iViom\y-\Anied. common jasper ; the 
agatejasper^ found only in agate veins; the^orc^- 
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 
pitch-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 Ochotzk 
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 ioUie 
and pelioma, and dichroite its exhibiting two 
different colours when viewed in difierent posi¬ 
tions; together with the blue quartz from Ora- 
yervi 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- 
larcrystals(w^ec//e-5/o/2e of Werner); thedelicately 
fibrous 
SALOON. 
Nat. HibX. 
