30 
saloon, sidered as compact Iepidolite.—Intermediate be- 
natThist. tween mica and talc, is the chlorite , among the 
varieties of which are the earthy, common, folia¬ 
ted, and the slaty: the last of these, with octohe- 
dral magnetic ironstone, bitter spar, &c.—Of talc 
we have the common or Venetian, which enters 
the composition of cosmetics, and the indurated 
talc : to the former of these may also be referred 
the beautiful green variety from Siberia, composed 
of distinct groups of small diverging-radiated 
laminae.— Potstone or ollite, the lapis comensis of 
the ancients, from Como in the Milanese, where 
it is turned on the lathe into most durable culinary 
vessels.—In this case is also placed a substance 
from New York, which has very much the appear¬ 
ance of white laminar talc, but is: a hydrate of 
magnesia . 
(Case 18.) Contains steatitic substances.— No¬ 
ble serpentine , which, in combination with pri¬ 
mitive limestone, constitutes the marmo verde 
antico; common serpentine , among the varieties 
of which are best known those from Bareuth and 
from Zoblitz in Saxony, where they are manufac¬ 
tured into vases and various other articles; ser¬ 
pentine with garnets, magnetic ironstone, asbest, 
slaty talc, &c.—Varieties of steatite, among which 
the most remarkable are those from Cornwall, that 
of a yellowish green colour from Greenland, that 
from Gopfersgriin in Bareuth, with small crystals 
of other mineral substances, converted into, and 
forming 
