260 



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



Microscopic examination of the steel molding sand showed 

 the following minerals which are listed in order of their 

 abundance : 



1. 



2. 

 3^ 

 4. 

 5. 

 6. 



Quartz. 



Kaolinite. 



Zircon. 



Limonite. 



Hematite. 



Tourmaline. 



Examination of three additional varieties of sand from this 

 plant disclosed quite a variation in the relative abundance of the 

 minerals, though of course quartz in all was by far the most 

 plentiful. 



Jackson Sand Mining Company. This, the southernmost 

 steel molding sand plant in Ohio, is located on the Cincinnati, 

 Hamilton & Dayton Ry., 2 miles north of Coalton, Jackson 

 County. The rock is the Sharon, but it is a sandstone, rather 

 than a conglomerate. The sandstone measures about 70 

 feet in thickness and forms two benches, separated by a thin 

 layer of clay. The lower bench is the coarser grained. 



The rock is reduced by a hammer pulverizer and is screened 

 but not washed. Two grades of sand are marketed, the white 

 and the light yellow. The product is used as molding sand for 

 steel and iron castings, furnace bottoms and brick kiln sand. 

 This plant has been in continuous operation for about 25 years. 



Two samples of sand and one sample of uncrushed rock 

 were analyzed with the following results: 



Silica, SiOa 



Alumina, AI2O3 



Ferric oxide 



Calcium oxide, CaO. . . . 

 Magnesium oxide, MgO 

 Titanium oxide, Ti02. . . 

 Loss on ignition 



Sand from 

 top ledge. 



96.79 

 2.00 

 .20 

 .00 

 .08 

 .17 

 .55 



Sand from 

 bottom ledge. 



98.50 

 .70 

 .22 

 .10 

 .00 

 .10 

 .35 



Uncrushed 

 rock. 



96.19 

 2 22 

 ^20 

 .00 

 .03 

 .18 

 .65 



A sample of uncrushed rock was examined microscopically 

 and the following minerals identified. They are listed in order 

 •of their abundance. 



1. Quartz. 



2. Zircon. 



3. Muscovite. 



4. Kaolin. 



5. Microcline. 



6. Limonite. 



7. Hematite. 



8. Rutile. 



9. Xenotime. 



