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Synthesis and crystal-chemistry of alkali amphiboles in the system Na2O-MgO-FeO-Fe2O3-SiO2-H2O as a function of fO2

✍ Scribed by Ventura, G. D.


Book ID
126681287
Publisher
Mineralogical Society of America
Year
2005
Tongue
English
Weight
535 KB
Volume
90
Category
Article
ISSN
0003-004X

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Stability of almandine in the system FeO
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Almandine, although decomposing in the presence of metallic iron into the anhydrous subsolidus assemblage fayalite + ferrocordierite + hereynite solid solution at low pressures, melts incongruently to hercynitess -~ quartz + liquid at 10 kb. At pressures between about 12 and 20 kb the products of in