GALLERY.] 
natural history. (Minerals.) 
57 
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- 
tenberyite from the Ural, the composition of which appears to approach 
very near to that of chlorite, or ripidolite ;—the yieseckite , from 
Greenland ;—the oosite, fahlunite or triclasite, from Fahlun in Sweden : 
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 parya - 
site ;—the actinolite or strahlstein (divided by Werner into the glassy, 
common, and fibrous varieties, and to which also belongs the ka- 
rinthine of this author);—the yrammatite 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— Arfvedsonite , and 
< Teyyrine , 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 wood, 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 krokydolite 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:— auyite, 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 jeffersonitc ;—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 distinctspecies, including 
