22 
SALOON. 
Kat. Hist. 
liceous substance called hornstone^ divided into the 
conchoidal and splintery varieties; among these 
are the remarkable pseudomorphous crystals from 
Schneeberg in Saxony, derived from various modifi¬ 
cations of calcareous spar, and generally referred to 
conchoidal hornstone; also some beautiful speci¬ 
mens of wood converted into hornstone, being the 
wood-stoiie of Werner; hornstone balls, from 
Haunstadt in Bavaria.— Flinty-slat &c. 
{Case 9.) In this case are deposited the different 
varieties or subspecies of jasper, such as they are 
enumerated by Werner, viz, the globular or Egyp^ 
tian jasper^ found chiefly near Cairo, in rounded 
pieces, which appear not to owe their form to roll-^ 
ing, but to be original and produced by infiltration; 
the ribbon jasper^ or striped jasper, the finest varie¬ 
ties of which are found in Siberia; the variously- 
tinted agate jasper, found only 
in agate veins; the porcelain jasper, which is pro¬ 
duced by the agency of subterraneous fire.—In this 
case are also contained the substances constituting 
the obsidian tribe, to which belong the pitch-stoney 
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 
iu globular 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 
