21 
, Schneeberg, in Saxony, derived from modifications 
of calcareous spar, and generally referred to con- 
choidal hornstone ; also some beautiful specimens 
of wood converted into hornstone, being the 
woodstone of Werner. 
(Case 9.) In this case are deposited the dif¬ 
ferent varieties or subspecies of jasper, such as 
they are enumerated by Werner, viz. the Egyp¬ 
tian or globular 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 
jasper, the finest varieties of which are found in 
Siberia; the variously tinted common jasper; 
the agate jasper, found only in agate veins ; the 
porcelain jasper, which is produced by the agency 
of subterraneous fire.—In this case are also con¬ 
tained the substances constituting the obsidian 
tribe, to which belong the pitch-stone, which is 
often confounded with semi-opalthe 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 Ochotsk in Si¬ 
beria, near the small river Marekanka, from 
which it has obtained the name of Marekanite ; 
—pumice, which is not alw'ays of volcanic origin. 
Near these substances are placed some specimens 
of 
SALOON. 
Nat. Hist. 
