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, per- 

 haps 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 Vangni, 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 locaHties, we beg 

 leave to mention violet fluor spar, abundant and very handsome, 

 near Shawnee Town, on the Ohio, in the Illinois Territory, 

 and galena, of which this fluor is the gangue ; — sulpbat of 

 magnesia, perfectly crystallized, 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- 

 eock ; — agates 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, abund- 

 ant in the bismuth vein, at Trumbull, Connecticut : — very 



* See Tilloch's Phil. Mag. Vol. XI.IT. p. ni. 

 Vol. I. ...No. 1. 4 



