22 
SALOON. 
Nat. Hist. 
Saxony, derived from modifications of calcareous 
spar, and generally referred to conchoidal horn- 
stone ; also some beautiful specimens of wood 
converted into hornstone, being the woodstonc 
of Werner; hornstone balls, from Haunstadt in 
Bavaria, &c. 
(Case 9.) In this case are deposited the dif¬ 
ferent varieties or subspecies of jasper, such as 
they are enumerated by Werner, viz. the globular 
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 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 sub¬ 
terraneous fire.—-In this case are also contained 
the substances constituting the obsidian tribe, to 
which belong the pitch-stone, which is often con¬ 
founded with semi-opalthe pearl-stone, so cal¬ 
led from its colour and the small globular concre¬ 
tions of which it is composed ;—the obsidian, a re¬ 
markable variety of which is that found in globu¬ 
lar pieces, at Ochotsk in Siberia, near the small 
river Marekanka, from which it has obtained the 
name of Marekanite ;— pumice, which is not in all 
cases of volcanic origin. Near these substances 
are placed some specimens of the iolite of Werner, 
also called dichroite from its exhibiting two 
different 
