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Stable Mineral Assemblages of Igneous Rocks - A Method of Calculation (Paperback, Softcover reprint of the original 1st ed. 1973)
Loot Price: R1,549
Discovery Miles 15 490
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Stable Mineral Assemblages of Igneous Rocks - A Method of Calculation (Paperback, Softcover reprint of the original 1st ed. 1973)
Series: Minerals, Rocks and Mountains, 7
Expected to ship within 10 - 15 working days
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This book represents the results of a lengthy study which Professor
ALFRED RITTMANN began some thirty years ago. The relationship
between the chemical and mineralogical composition of igneous rocks
is established as far as is possible. Petrographers will appreciate
that this problem is extremely complex, particularly since this
relationship forms the basis of the classification and nomenclature
of igneous rocks. The ingenious scheme of calculation of the
CI.P.W. norm system is essentially chemical in nature. The
compositions of the stoichiometrically ideal "normative minerals"
do not correspond to those of the constituent minerals found in
rocks. Although the "norm" is not intended to equal the "mode" or
actual mineral composition of a rock, at least a qualitative
agreement between the norm and the mode is desirable. For a number
of rocks and rock groups, especially the leucocratic and silicic
rocks, the deviation of the norm from the mode is generally within
tolerable limits. For the melanocratic and highly subsilicic rocks,
on the other hand, the CI.P. W. scheme of calculation too often
yields results which fail to reflect the observed mineral
composition. The anomalies produced in the cal culation of
extremely subsilicic volcanic rocks have recently been briefly
discussed by F. CHAVES and H. S. YODER, JR. (1971)."
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