112 
NATURAL HISTORY. 
[long 
likewise very imperfectly understood. Among the Speci¬ 
mens of talc in this glass Case may be specified the com¬ 
mon or Venetian (which enters into the composition of cos¬ 
metics), and the indurated talc; to the former of which 
may be referred the green radiated variety from Siberia, 
composed of distinct groups of small diverging laminae, 
and to which the name of pyrophyllit ehas lately been given ; 
— agalmatolite . (Werner’s bildstein, Haiiy’s talc gla- 
phique), employed by the Chinese for carving images, 
vessels, &c,;— chlorite , crystallized in aggregated, small, 
modified rhombic prisms; the earthy and foliated varieties, 
coating crystals of octahedral magnetic iron-stone, &c.;— 
finite, crystallized in regular hexagonal prisms, and gie- 
seckite, from Greenland, which appears to be a variety of 
it.— Fahlunite , under which name several distinct sub¬ 
stances have been noticed by authors. 
Case 33. This and part of the following Case chiefly 
contain substances related to hornblende or amphibolic 
minerals, among which may be specified the basaltic and 
common hornblende, including the pargasite the actino- 
lite or strahlstein (divided by Werner into the glassy, 
common, and fibrous varieties) ;—the grammatite or tremo - 
lite (so called from Val Tremola, where, however, it is 
not found), among the specimens of which are the fine, 
fibrous varieties, resembling asbest; the glassy tremolite, 
in dolomite and granular limestone, &c.-—Arfvedsonite — 
Anthophyllite . 
Case 34. Part of this Case is filled with the mineral 
substances called asbestine, many of which appear to pass 
into some of the varieties of amphibole in the preceding 
glass Case. Among these may be observed specimens illus¬ 
trative of the transition from a very close to a loose fibrous 
structure;—several varieties of the flexible asbest or 
amianth, with some antique incombustible cloth, paper, 
&c., made of it;—the varieties called common and schiller- 
asbest, mountain wood, mountain cork, or nectic asbest, 
&c ., separate, and in combination with other substances; 
—the blue and yellojv asbest from South Africa, to which 
the name of krokydalite has been given. The remainder of 
this Case contains pyroxenic minerals :— augiti yin separate 
crystals, and imbedded in lava from Vesuvius, together with 
groups of well-defined crystals from Arendahl in Norway, 
