Masters Theses


“The geochemistry and mineralogy of four flint clay deposits (Pennsylvanian, Cheltenham Formation) in Gasconade County, Missouri, were investigated relative to their refractory behavior. Forty-five core drill samples, characterized mineralogically by XRD and SEM-EDS analysis, and geochemically by ICP, total organic carbon (TOC) analysis and free iron analysis, were compared to standard refractory tests performed on the same samples by A. P. Green Industries Inc., Mexico, Missouri.

Clay minerals include kaolinite with minor illite, illite/smectite mixed layer, a cookeite like mineral (Li Al4 (AI,Si)4 O10 OH8) and boehmite. In the non-clay fraction, previously unreported phosphate minerals francolite (Ca5(PO4, CO3)3F), variscite (AIPO4·2H2O) and wavellite (Al, (OH)3 (PO4)2 · 5H2O) were identified. Other non-clay minerals include quartz, pyrite and the previously reported phosphate mineral gorceixite-goyazite ((Ba, Sr, Ca, Ce) Al3 (PO4)2 (OH)5·H2O (?)).

Geochemical analysis indicate trace amounts of copper, nickel, yttrium, vanadium and zirconium in unusually high concentrations. TOC contents show values from 0.01 to 0.67% in white to black samples respectively. Free iron values are generally low and show a maximum concentration of 35 ppm.

Phosphorous and calcium in phosphate minerals produce “alkali” effects, lowers refractoriness, and has variable effects on the firing properties. Potassium, in illite and illite/smectite, seems to lower the fired grain density while TOC content does not. Lithium in cookeite does not lower the pyrometric cone equivalent as proposed previously”--Abstract, page iii.


Bolter, Ernst

Committee Member(s)

Gregg, Jay M.
Moore, Robert E., 1930-2003


Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology and Geophysics


The author would like to acknowledge the financial support of the United States Department of the Interior, Bureau of Mines.


University of Missouri--Rolla

Publication Date

Summer 1992


xiii, 149 pages

Note about bibliography

Includes bibliographical references (pages 140-148).

Geographic Coverage

East Central Missouri


© 1992 David John Keller, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Thesis Number

T 6436

Print OCLC #


Link to Catalog Record

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