LEONHARD NOTES ON THE MINERALOGY OF MISSOURI. 44I 



BORNITE. 



At Si. Genevieve Copper Mines. Massive with other copper ores. 

 Cuprite. 



At Stanton Copper Mine, Franklin Co. In acicular crystals (Chalco- 



trichite). 

 hX St. Genevieve Copper Mines. Massive, of brown-red color ("Tile 

 Ore.") 

 Melaconite. 



At St. Genevieve Copper Mines. Massive, black, earthy up to \ an inch 

 thick, on Chalcopyrite. 

 Malachite. 



At St. Genevieve Copper Mines. Acicular crystals, up to \ of an inch 

 long; in bands of columnar fibrous structure, in Limonite or with Cu- 

 prite. Also mixed with clay, in light green, earthy, porous masses. 

 At all other copper mines in the State, vide Chalcopyrite. 

 At Scotia Iron Bank, Craivford Co., in globular aggregations, up to ^ 



of an inch in diameter, in drusy cavities of Specular Iron Ore. 

 At Collins Mine, Cooper Co., and at Abbott Bank, Miller Co., in drusy 



cavities of Limonite. 

 In Wright and Ozark Cos., disseminated through Calcite. 

 Also in many localities, in small particles disseminated in limestone. 

 AZDRITE. 



At Scotia Iron Bank, Crawford Co., in soft Red Hematite, as a light 

 blue lining of irregular cavities, or as a dark blue filling of crevices, 

 with columnar fibrous structure. 

 At St. Genevieve Copper Mines, in small crystals on Limonite, but 



mostly massive. 

 Also at all other copper mines of Missouri, vide Chalcopyrite. 

 €halcanthite. 



At St. Genevieve Copper Mities, as light blue coating on Covellite. 



LEAD. 



Galenite. 



In numerous localities, which may be grouped in three districts : 



1. In Soutk-Tvest Missouri— 2it Granby, Neivton Co.; ^t Joplin s.x\A 

 Oronogo, Jasper Co. Crystals in cubes, octahedrons (up to 4-inch 

 side-length) or dodecahedrons, but mostly in combinations of these 

 forms. Compact crystalline masses, with Sphalerite or Calamine in 

 Dolomite, chert, or clay. In Joplin, sometimes impregnated by 

 bitumen. Contains about i oz. of Silver per ton. 



2. In Central Missouri in many places, principally in Morgan Co., 

 Miller Co. and Cole Co.— \n cubes, with a side-length up to 6 inches, 

 generally coated with Cerussite, and in crystalline masses weighing 

 up to 5,000 lbs. and more, embedded in red clay, or in altered mag- 

 nesian limestone, or with Barite. At Sampson's Coal Mine, Moni- 

 teau Co., filling fissures in cannel-coal. Contains only a small 

 trace of Silver. 



