141 
stalactic, fibrous and crystallized varieties (the large 
group of crystals is artificially prepared) are from Her- 
rengrund in Hungary. There are also two or three sub¬ 
sulphates of copper placed in this case, which, however, 
stand in need of more accurate chemical examination. 
—Sulphate of lead, or lead vitriol , of which we have a 
suite of specimens with brilliant and well defined crys¬ 
tals from Badenweiler in Suabia, from the Parys mine in 
Anglesea, &c.; —the sulphato-carbonate , and sulphato-tri- 
carbonate of lead , from Leadhills, &c. The rest of this 
Case is occupied by sulphates of alumina common alum , 
crystallized, fibrous, &c., from various places; and the 
hydrous subsulphate of alumina , called aluminite , or 
voebsterite , from Sussex and from Halle in the territory 
of Magdeburg, which was by some mistaken for pure 
alumina, and by others for hydrate of alumina with 
mechanically admixed sulphate of lime : it must not be 
confounded with the aluminite or alum-stone (alunite of 
some mineralogists,) from Tolfa, &c., which is a basic sul¬ 
phate of alumina and potassa. 
Case 59 contains the fiuorides , of which by far the 
most important species is the fluoride of calcium, ge¬ 
nerally called fiuate of lime and fuor spar; among its 
numerous varieties may be particularized, the rose- 
coloured crystals from Chamouni; the phosphorescent 
massive fluor spar, called chlorophane, from Siberia; 
the varieties called foi tification fluor; earthy and com¬ 
pact fluor, &c., chiefly from Derbyshire and Saxony.— 
Fluoride of calcium , yttrium and cerium; —yttrocerite; 
and some related minerals from Finbo and Brodbo near 
Fahlun in Sweden. Fluoride of sodium a?id aluminum , 
called cryolite , found in West Greenland: pure and 
mixed with brown iron stone, galena, &c. 
Case 60 contains the chlorides.-—Chloride of so¬ 
dium (muriate of soda), or rock salt: the most inter¬ 
esting specimens here deposited of this important mi¬ 
neral substance, are the crystallized varieties, the mas¬ 
sive and fibrous coloured varieties, the red chiefly 
from Hallein in Tyrol, the blue and violet from Ischel 
in 
LONG 
GALLERY. 
Nat. Hist. 
