INDUSTRIAL PROGRESS DURING THE YEAR 1875. xcix 



limonite. It is of a black color, vitreous lustre, and with a 

 conchoidal fracture. It is found at West Chester, Pa., and 

 was described by Professor J. G. Cooke. 



Rauite. A hydrous silicate, perhaps identical with thora- 

 sonite. It is from the island of Lamo, near Norway. 



JZivotite contains antimonic acid and carbonate of copper, 

 amorphous with yellow color. Described by Ducloux. 



Siegburgite. A new hydrocarbon, containing eighty-five 

 per cent, of carbon. Found at Siegburg, near Bonn. 



Wapplerite. An arseniate of lime, containing water. It 

 crystallizes in the triclinic system; and is allied to pharma- 

 colite. Found by Frenzel at Joachimsthal. 



In addition to the above, Scacchi, in a recent memoir on 

 the eruption of Vesuvius in 1872, has described the following 

 new minerals found by him as products of sublimation : Ate- 

 lite, chlorocalcite, cryptohalite, chloromagnesite, chlorallumi- 

 nite, cupromagnesite, dolerophanite, erythrosiderite, chloro- 

 thionite, hydrofluorite, hydrocyanite, proidonite, pseudoco- 

 tunnite. For their characters, as far as described, reference 

 must be made to the original research. 



GEOLOGY. 



Much attention has of late been turned to the study of the 

 crystalline rocks in the southern part of the great Appalachian 

 chain, and many important observations have been made. Ac- 

 cording to Eugene Smith, the state geologist of Alabama, we 

 find to the southeast of the undoubted paleozoic rocks in that 

 state a belt of crystalline limestones, which are overlaid, in 

 apparent conformability, by a series of strata estimated at. 

 15,000 to 20,000 feet, the whole dipping at high angles to 

 the southeast. These consist of greenish-gray hydro-mica 

 schists, the so-called talcose slates or nacreous argillites, in- 

 closing layers of quartz in their upper part, and succeeded 

 by great beds of quartzite, laminated, schistose, and conglom- 

 erate, with chloritic and talcose schists and roofing- slates. 

 These, regarded by Professor Smith as the equivalents of the 

 Ocoee group of East Tennessee, are by him considered prob- 

 ably of pre-Cambrian or Eozoic age, and referred to the Hu- 

 ronian. 



They are succeeded to the southeast by gneisses, horn- 

 blendic rocks, and coarse mica-slates with granitic veins, 



