THK NONMETALLIO MINERALS. 273 



the heels and this eonclioidal fnicture the stone ean not be split into 

 thin sla]).s, hut must be sawn. No satisfactory road yet exists for its 

 transportation in blocks of any size, and such material as has thus far 

 been produced is in small slabs such as can be "packed." Those who 

 haA-e inspected the properties express themselves as satisfied that 

 blocks of oood size and satisfactory quality can be had in quantity. 



The Ahibama stt)ne as examined by the writer is finely granular and 

 too fria])ie for satisfactory Avork. Qualitative tests showed it to be a 

 siliceous magnesian limestone. It is of course possible that the single 

 sample shown does not fairly represent the product. The Arkansas 

 deposit is situated in Township 14° N., R. 15° W. of the 5th p. m., 

 sections 14, 23, and 2-1:, Searcy County. The color is darker than that 

 of the Bavarian stone. The reports of those who have tested it are 

 represented as ])eing uniformly favorable. 



The Illinois stone is darker, but to judge from the display made in 

 the Illinois building at the World's Columbian Exposition, 1803, is 

 capable of doing excellent work and can be had in slabs of good size 

 (Specimens Nos. 61344 and 62570, U. S.N.M.). The Kentucky stone is 

 hard and brittle, though that from Eowan County is stated to have 

 received a medal at the exposition of 1876. It is fine grained and 

 homogeneous and very pure, only a small flocculent residue of organic 

 matter remaining insoluble in dilute hydrochloric acid. 



The Indiana stone is harder than the Bavarian, and samples exam- 

 ined were found not infrequently traversed by fine, hard veins of 

 calcite. (Specimen No. 25030, U.S.N.M.) 



The stone from Saverton, Missouri, is compact and fine grained, with, 

 however, fine streaks of calcite running through it. (Specimen No. 

 28498, U.S.N.M.) It leaves only a small brownish residue when dis- 

 solved in dilute acid. This stone has been worked quite successfully 

 on a small scale. The State geologist, in writing on the subject, says: ^ 



Some of the beds of the St. Louis limestone (Subcarboniferous) have been success- 

 fully used for lithographic work. No bed is, however, uniformly of the requisite 

 quality, and the cost of selection of available material would seem to preclude the 

 development of an industry for the production of lithographic stone. From the 

 deposit at Overton, Tennessee, it is stated slabs 40 by 60 inches by 3J inches thick 

 were obtained, though little, if anything, is now being done. An analysis of this 

 stone is given in the table. Other promising finds are reported from McMinn 

 County, in the same State. According to the State geological reports, the stone 

 lies between two beds of variegated marble. The stratum is thought to run entirely 

 through the county, but some of the stone is too hard for lithographic purposes. 

 The best is found 8 miles east of Athens on the farm of Robert Cociirane, and a 

 quarry has been opened Ijy a Cincinnati company, which only i)ays a royalty of $250 

 per annum. It is sold for nearly the same price as the Bavarian stone. It is a cal- 

 careous and argillaceous stone, formed of the finest sediment, of uniform texture, 

 and possesses a pearl -gray tint. The best variety of this stone has a conchoidal 

 fracture and is free from spots of all kinds. 



1 Bulletin No. 3, Geological Survey of Missouri, 1890, p. 38. 



NAT MUS 99 18 



