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The Ohio Journal of Science [Vol. XXI, No. 8, 



coldest weather. This quarry is reported to have been opened 

 about 30 years ago and to have supplied much heavy stone for a 

 breakwater at Cleveland. The sand plant was erected in 1909 

 and has been in possession of its present owners for approxi- 

 mately 10 years. 



Following are two analyses of the sand, the first from a bin 

 sample and the second. from chips from the lower part of the 

 quarry : 



Silica, Si02 



Alumina, AI2O3 



Ferric oxide 



Calcium oxide, CaO. . . . 

 Magnesium oxide, MgO. 

 Titanium oxide, Ti02. . . 

 Loss on ignition 



Microscopic examination of the first sample showed the 

 following minerals, named in order of their abundance : 



1. 

 2. 



3! 



4. 



5. 



Quartz. 



Limonite. 



Kaolinite. 



Feldspar. 



Muscovite. 



6. Zircon. 



7. Sericite. 



8. Apatite. 



9. Titanite. 



Summit Silica Company. This is located just south of 

 Barberton, Summit County. A ledge of Sharon conglomerate, 

 45 feet high, is the basis of the industry. In places the pebbles 

 make up the mass of the rock, while elsewhere they may be 

 restricted to the upper part and in other places to the lower part 

 of the quarry. Most of the pebbles are less than one inch in 

 diameter, but one measuring 3 inches was found. Practically 

 all colors occur, but light shades prevail. Large cracks filled 

 with clay were observed and some of these extended to the 

 base of the quarry. Moreover, chunks of clay were noted in 

 places in the rock. 



After blasting, the rock is loaded on cars with a steam 

 shovel and hauled to the mill with mules, where it is reduced to 

 sand by a gyratory crusher, disintegrator, and rolls. The 

 material is then washed and that for sand blasting passed 

 through a cylinder drier, after which it is screened. The 

 coarse material from the screens is put through the rolls, after 



