An investigation of the silica deposits of southern Illinois . well enough. Each residue was v/eighed, the silica content deterained, (thus giving theimpurities left by difference), exainined under a microscope and the first residuegiven another fusion test. The follov/ing are resvilte obtained. Samrile 1847 - Gannister Portion 1st Residue Nature of % inMaterial residue Chert ^ 2nd Residue Too small to ^be determined Residue Sett-led by additionof HCl $ asSiO^ ^ ^ Portion1st Residue Nature ofMaterial Chert Sample 125 - Gannister i in i as residue 2nd Residue
An investigation of the silica deposits of southern Illinois . well enough. Each residue was v/eighed, the silica content deterained, (thus giving theimpurities left by difference), exainined under a microscope and the first residuegiven another fusion test. The follov/ing are resvilte obtained. Samrile 1847 - Gannister Portion 1st Residue Nature of % inMaterial residue Chert ^ 2nd Residue Too small to ^be determined Residue Sett-led by additionof HCl $ asSiO^ ^ ^ Portion1st Residue Nature ofMaterial Chert Sample 125 - Gannister i in i as residue 2nd Residue Too small to ^ be determinedResidue Settled by addition ** ^of HCl. SiOg ^, $ asImpurities ^ io asImiDurities Fusion Pointin Cones. 31 Portion1st Residue2nd Nature ofMaterial Chert Sample 126 - ^ as Too small to be determined ^Residue settled by addition ** HCl. ^ ^ ,$ $ as ^ $ Fusion Pointin Cones. 31 Fusion Pointin Cones 31-32. 14. The second and third residue in each case were exceedingly fine grained tmdyellow in color. The change in color shows the decrease in impurities by wash-ing, which is further checked by the percent of silica in the residue. Thepossibility of increasing the refractory property of the garnister is evident,if this would not affect the other properties required by of Inversion The rate at which a silica material (as was pointed outbefore), invei-te frem one form to another, is one of the most important featuresdetermining its quality as a refractory substance. The agents for bonding thematerials, v/hich are necessary, might be so selected as to accelerate this in-version without affecting the refractoriness materially. Such materials werechosen with others for the purpose of determining the effect of these bondingagents upon the rate of inversion of the materials. The general method used,was as follows. Ea
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
