June, 1921] Steel Molding Sand in Ohio 257 



which it is re-screened. The sand is used for steel castings, 

 blasting sand, glass making, and for concrete. The pebbles 

 are the source of sand for blasting, while the sand proper yields 

 molding and glass sands. Three grades of molding sand are 

 made and five grades of blasting sand. The market extends 

 from Pittsburgh to Chicago and Milwaukee. 



A sample of unwashed and unscreened sand from this plant 

 had the following composition : 



Silica, SiOa. 97.41 



Alumina, AI2O3 58 



Ferric oxide 31 



Cilcium oxide, CaO • . 11 



Magnesium oxide. MgO 00 



Titanium oxide, Ti02 09 



Sodium oxide, Na20. . 04 



Potassium oxide, KoO 08 



Loss on ignition 44 



Microscopical examination showed the following minerals 

 present. These are named in order of their abundance : 



1. Quartz. 5. Feldspar. 



2. Magnetite. 6. Muscovite. 



3. Zircon. 7. Apatite. 



4. Kaolinite. 



Franklin Industrial Company. This plant is located on the 

 Pennsylvania Railroad about one mile west of Warwick, Wayne 

 County. A ledge of 50 feet of Sharon conglomerate is the 

 basis of the industry. The rock is reduced in a jaw crusher 

 and then passed through three sets of rolls, after which it is 

 screened. Part of the material is put through a rotary drier. 

 The product is used for steel castings, furnace bottoms, and by 

 traction lines. The output is about 100 tons per day and the 

 plant operates throughout the year. 



A sample of unwashed and undried sand from this plant 

 gave the following analysis: 



Silica, SiOa 97.47% 



Alumina, AI2O3 72 



Ferric oxide 38 



Calcium oxide, CaO 00 



Magnesium oxide, MgO 06 



Titanium oxide, Ti02 09 



Loss on ignition 60 



Microscopical examination showed the following minerals, 

 which are listed in order of their abundance : 



1. Quartz. 6. Microcline. 



2. Tourmaline. 7. Sericite. 



3. Zircon. 8. Hematite. 



4. Limonite. 9. Rutile. 



5. Kaolinite. 10. Zenotime. 



