30 
saloon, ironstone, bitterspar, &c. — Of talc we have the 
Nat Hist, common or Venetian, which enters the composi¬ 
tion 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.— Pot- 
stone or ollite, the lapis cnmensis of the ancients, 
from Gomo 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 appearance of white lami¬ 
nar talc, but is a hydrate of magnesia - 
(Case 18.) contains steatitic substances.—- No¬ 
ble serpentine, which, in combination with primi¬ 
tive limestone, constitutes the marmo verde antico; 
common serpentine , among the varieties of which 
are best known those from Bareuth and from Zob- 
litz in Saxony, where they are manufactured into 
vases and various other articles; serpentine with 
garnets, magnetic ironstone, asbest, slaty talc, &e. 
— Triclasite or fahhmite, from Sweden and Green¬ 
land.—Varieties oi steatite, among which the most 
remarkable aie those from Cornwall, that of a yel¬ 
lowish green colour from Greenland, that from 
Gdpfersgriin 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 with regard to their 
chemical 
