Review of Cleaveland’s Mineralogy. 49 
ing the usual brilliant foliated fracture. The part which looks 
like sulphuret of lead is easily reducible by the blowpipe, but 
not the whole crystal, as authors appear to imply; for if that 
part of the crystal which does not present the appearance of 
galena, is heated by the blowpipe flame, it is not reduced, but 
congeals into the garnet dodecahedron, with its colour unal- 
tered: these crystals are therefore phosphat of lead, and they 
appear to be either an original mixture of phosphat and sul- 
phuret of lead, or the phosphat has somehow in part given up 
its phosphoric acid, and assumed in its stead sulphur, perhaps 
from the decomposition of sulphuretted hydrogen. 
Professor Cleaveland will, of course, add new localities, even 
foreign ones, where they are interesting, and domestic ones, 
where they are well authenticated. Among the former, we 
trust he will mention the lake of sulphuric acid contained in 
the crater of Mount Idienne, in the Province of Bagnia Vang- 
ni, in the eastern part of Java, and also the river of sulphuric 
acid which flows from it, and kills animals, scorches vegetation, 
and corrodes the stones.* Among American localities, we beg 
leave to mention beautiful violet fluor spar, and abundant, 
near Shawnee Town, on the Ohio, in the Illinois Territory, 
and galena, of which this fluor is the gangue;—sulphat of 
magnesia, beautifully erystallized, in masses composed of deli- 
cate white prisms, in a cave in the Indiana Territory, not very 
remote from Louisville, in Kentucky; it is said to be so 
abundant that the inhabitants carry it away by the wagon 
load ;—pulverulent carbonat of magnesia, apparently pure, 
found by Mr. Pierce at Hoboken, in serpentine, where 
the hydrate of magnesia was found ;—chabasie, agates, chalce- 
dony, amethyst, and analcime, at Deerfield, by Mr. E. Hitch- 
cock ;—aeates in abundance at East-Haven, near New-Haven: 
in secondary greenstone, like the above named minerals at 
Deerfield ;—saline springs, covered with -petroleum, and emit- 
ting large volumes of inflammable gases, numerous in New- 
Connecticut, south of Lake Erie; magnetical pyrites, abun- 
dant in the bismuth vein, at Trumbull, Connecticut ;—very 
* See a Phil, Mag. Vol. XLII. p. 182. 
Vou. L....No. 7 
