A combined gravimetric and photometric procedure for determining silica in silicate rocks and minerals

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Abstract
478 JEFFERY AND WILSON: A COMBINED GRAVIMETRIC AND PHOTOMETRIC WOl. 85 A Combined Gravimetric and Photometric Procedure for Determining Silica in Silicate Rocks and Minerals' BY P. G. JEFFERYT AND A. D. WILSON (Department of Scientific and Industrial Research, Laboratory of the Government Chemist, Geological Surve