72 
natural history. (Minerals.) 
[north 
of the elceolite or fettstein of Werner;—the wernerite, under which 
name, formerly confined to some varieties of common and compact 
scapolite, are now by most mineralogical writers united the meioniie 
of Vesuvius, and the greater part of the scapolite , the paranthine, the 
dipyre , the nuitallite , the bergmannite, the rosellite, and the amphodelite; 
substances which, together with several others provisionally placed in 
this Case, stand in need of further investigation as to their chemical 
and crvstallographical characters. 
Case 32 contains chiefly micaceous and talcose substances. Our 
imperfect knowledge of the optical properties and chemical constitution 
of many varieties of the former, does not admit of their being arranged 
according to those distinctive characters; such varieties as have been 
more closely examined in this respect, may be divided into potassa-mica 
(by far the most common), which has two axes; magnesia-mica (biotite 
of Hausmann), which has but one axis : in characteristic specimens 
from various localities, particularly from Vesuvius, where it occurs in 
small, but brilliant and transparent six-sided prismatic crystals; and 
lithia-mica , which besides the beautiful peach-blossom, red, violet, 
greenish-grey, and white scaly varieties known by the name of lepidolite , 
(some varieties of which, however, are referable to the silicates com¬ 
bined with fluorides, in Case 58 A,) 'from Rozna in Moravia, also 
comprises several large-foliated varieties of what was formerly con¬ 
sidered as common mica, such as that from Zinnwald in Bohemia 
and Altenberg, accompanied by apatite, tinstone, and topaz. 
The species and varieties of the talc-like substances are likewise very 
imperfectly understood. Among the specimens of talc in this Table 
Case, some varieties of which are chemically related to steatite, may 
be particularized the common or Venetian (w T hich 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: 
this latter mineral substance, however, together with the weissite , the 
chlorophyllite, the praseolite , the aspasiolite, the bonsdorfite, as also 
several varieties of the pinitc 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 ka- 
rinthine of this author) ;—the grammatite or tremolite (so called from 
