Chemical Composition and Mineralogy

The average chemical compositions of the various differentiated facies of the Dufek intrusion in Appendix 13.6.8 and Fig. 13.43 show the effects of fractional crys- 

13 Ferrar Group Dolerite Sills and the Dufek Intrusion 

The rocks of the Dufek intrusion have a wide range of densities which correlate positively with the abundance of pyroxene. This relationship in Fig. 13.44 was worked out by Ford and Nelson (1972, Fig. 1) who measured the densities of approximately 600 rock samples of the Dufek intrusion. The results indicate that the different rock types can be characterized by their densities in grams per cubic centimeters  

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Chemical Composition and Mineralogy of Marine Sediments Table 1 Mineral constituents of marine sediments classified by origin. 

Table 15-1 Ranges of Chemical Composition and Mineralogical Phases Present in Acid Brick (Red Shale and Fireclay)...

Fig. 13.8 The concentrations of silica and of alkali metals of the sills of Ferrar Dolerite in the ice-free valleys of southern Victoria Land place these rocks into the quartz dolerite and diorite fields. The high concentrations of silica and low content of alkali metals also identify these rocks as subalkalic quartz-normative tholeiites. The rocks are classified as dolerites because they are primarily composed of calcic plagioclase and pyroxenes with ophitic texture. The Ferrar Dolerite closely resembles the Kirkpatrick Basalt in terms of chemical composition and mineralogy, but differs by its ophitic texture and intrusive mode of occurrence. Accordingly, dolerite sills and basalt flows are assumed to have formed from the same mafic magma (Data from Hamilton 1965)...

However, the physical properties, chemical composition and mineralogy of the fly ash largely influence its conversion to zeolites, and their resulting grade and overall characteristics. Further, the formation of one or more combination of zeolites mainly depends on the available contents of silica and alumina in amorphous glass form. 

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