53 
natural history. (Minerals.) 
[north 
Case, some varieties of which are chemically related to steatite, may 
be particularized the common or Venetian (which enters into the com¬ 
position of cosmetics), and the indurated talc; to the former of which 
was also formerly referred the green radiated talc from Siberia, com¬ 
posed of distinct groups of small diverging laminae, and which is known 
under the name of pyrophyllite; — potstone, ollite, or lavezzo (the 
lapis comensis of Pliny), which appears to be an intimate mixture of 
talc and asbest, chiefly from Chiavenna, near Como, where it is 
manufactured into culinary vessels;— chlorite , crystallized in ag¬ 
gregated, small, modified rhombic prisms : the earthy and foliated 
varieties, coating crystals of octahedral magnetic iron-stone, &c. 
Other related mineral substances are—the pennine ;—the scarce leuch - 
tenbergite from the Ural, the composition of which appears to approach 
very near to that of chlorite, or ripidolite ;—the gieseckite, from 
Greenland;—the oosite, fahlunite or triclasite , from Fahlun in Sweden r 
this latter mineral substance, however, together with the weissite, also 
chlorophyllite , the praseolite, the aspasiolite , the bonsdorfite , as the 
several varieties of the pinite in this Table Case, are now by some 
mineralogical writers considered as only metamorphoses of cordierite 
or iolite (Case 36). 
Case 33. This and part of the following Case chiefly contain 
amphibolic and pyroxenic and related minerals, among which may 
be specified the basaltic and common hornblende , including the parga- 
site ;—the actinolite or strahlstein (divided by Werner into the glassy, 
common, and fibrous varieties, and to which also belongs the ha - 
rinthine of this author) ;—the grammatite or tremolite (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 .—Arfuedsonite, and 
cegyrine, a variety of it;— raphilite , &c. 
Case 34. Part of this Case is occupied by the mineral substances 
called asbestine , many of which pass into some of the varieties of horn¬ 
blende ; others, both asbest and amianth, are modifications of the state 
of aggregation of different amphibolic substances; and to these Breit- 
haupt also refers his kymatine, metaxite, peponite, and pycnotrope. 
Among them may be observed specimens illustrative 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 wmod, mountain cork, or nectic asbest, &c., separate, 
and in combination with other substances;—the blue and yellow asbest 
from the Orange River, South Africa, for the former of which the name 
of hrokydolite has been proposed, while the other appears to be a 
silicate of iron. The remainder of this Case and part of the next con¬ 
tain pyroxenic minerals :—augite, in separate crystals, and embedded 
in lava from Vesuvius, together with groups of well-defined crystals 
from Arendal in Norway, where this substance occurs in primitive 
rocks ;—the jeffersonite ;—the granular variety called coccolite ;—the 
hypersthene and paulite (Labrador hornblende of Werner);—the 
lievrite , also called ilvaite and yenite , in particularly perfect crystals, 
chiefly from Elba: the wehrlite appears to be a variety of this species; 
—the varieties of diopside , at first considered as distinct species, including 
