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Enstatite-diopside solvus and geothermometry
The enstatite-diopside solvus presents certain interesting thermodynamic and crystal-structural problems. The solvus may be considered as parts of...
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Thermodynamics of coexisting cummingtonite-hornblende Pairs
The activity-composition relations for calcium-rich and calcium-poor amphiboles are calculated from the composition of coexisting...
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Compositional dependence of the coexisting pyroxene iron-magnesium distribution coefficient
Iron-magnesium distribution coefficients for coexisting ortho- and clinopyroxene in 22 amphibolites from the New Jersey Precambrian Highlands range...
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Mg, Fe2+ site occupancies in coexisting pyroxenes
The separate distributions for MgSiO 3 and FeSiO 3 in coexisting pyroxenes from the Skaergaard and Bushveld intrusions and charnockites, which were...
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Chlorites
The chlorite group of minerals derives its name from the common green color of most varieties. The color is known to vary widely in different...
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Order disorder in sillimanite
AP 3+ -Si 4+ disordering in sillimanite cannot be considered as ideal mixing on tetrahedral sites. Ideal free energy of mixing in sillimanite...
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Garnet-orthopyroxene and orthopyroxene-clinopyroxene relationships in simple and complex systems
Use of simple mixing models of orthopyroxene and garnet solid solutions enables extrapolation of experimentally determined equilibria in the MgSiO 3 -Al
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P total, \(P_{H_2 O} \) and the occurrence of cummingtonite in volcanic rocks
The phenocryst assemblage of cummingtonite, orthopyroxene, quartz, titanomagnetite and ilmenite in rhyolites of New Zealand has been used to...
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The origin of biotite in archaean meta-sediments near Yellowknife, N. W. T., Canada
Data on mineral compositions, modal proportions and textural relations are used to deduce the biotite-forming reaction in Archaean meta-greywackes...
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Crystalline Solutions and Geothermometry
The concept of metamorphic facies evolved through the attempts of the petrologists to distinguish the mineral assemblages formed at different P and T...
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The mineralogy of the glaucophane schists and associated rocks from Île de Groix, Brittany, France
Ninety-seven mineral phases consisting of ten chloritoids, fifteen epidotes, sixteen garnets, four sphenes, seven rutiles, seven pyroxenes, thirteen...
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Greenschist amphiboles from Haast river, New Zealand
A section across the Haast Schist Group in the Southern Alps of New Zealand shows a sequence of metamorphosed eugeosynclinal sediments. Meta-basic...
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The sillimanite-potash feldspar isograd in Western Maine, U.S.A.
The techniques of electron probe microanalysis and x-ray diffractometry have been utilized in a study of the sillimanite-potassium feldspar isograd...
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Crystal Chemistry of Sedimentary Carbonate Minerals
Calcite, CaCO3, is the most abundant carbonate mineral. This follows from the predominance of limestones over other carbonate rocks. In view of the...
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Pyroxene Crystalline Solution
Orthopyroxene is one of the few important rock-forming minerals that can be considered as quasi-binary without significant loss of accuracy. Usually...