30 
saloon, common or Venetian, which enters the composi- 
NatTh~j5t. tion of cosmetics, and the indurated talc : to the 
former of these may also he referred the beauti- 
ful green variety from Siberia, composed of dis^ 
tinet groups of small diverging-iadiated laminae. 
— Potstone or oilite, the lapis comensis of the an- 
cients, from Como in the Grison country, where 
it is turned on the lathe into most durable culi- 
nary vessels. — -In this case is also placed a sub- 
stance from New York, which has very much 
the appearance 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 mar mo verde 
antico ; common serpentine, among the varieties 
of which are best known those from Bareuth and 
from Zoblitz in Saxony, where they are manu- 
factured 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 part of, the massive steatite. — 
To these are added some substances which are 
allied to the preceding, though different from 
them 
