Computer Science
Scientific paper
Nov 1954
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1954gecoa...6..157y&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 6, Issue 4, pp.157-168
Computer Science
27
Scientific paper
A hydroxyl-bearing phlogopite has been synthesized and its upper stability limit determined up to 75,000 psi water vapour pressure. Above the upper stability limit the stable phases are forsterite + leucite + orthorhombic KAlSiO 4 + vapour. At the lowest temperatures investigated the mica grows quickly as randomly stacked one-layer monoclinic phlogopite (1Md). At higher temperatures or with longer runs the mica orders to either a one-layer monoclinic (1M) or a three-layer trigonal (3T) polymorph. It is not possible to distinguish the 1M or the 3T polymorphs by means of powder X-ray diffraction patterns; however, the two-layer monoclinic (2M) mica is easily identified. The small size of the synthetic crystals prohibited identification of their polymorphic form by optical methods or single-crystal studies. The upper stability range of two natural phlogopites is in accord with that of synthetic phlogopite. The transformation of a natural 2M to a 1M or a 3T was accomplished; however, the stability ranges of the natural phlogopite polymorphs could not be fixed because of the sluggish nature of the transformations and the character of the recrystallization. The behaviour of phlogopite in igneous rocks high or low in silica is accounted for by the relation of its stability curve to the minimum melting curves of "granite" and "basalt." The trioctahedral clay micas are identified structurally as IMd micas. The completely disordered phlogopite produced synthetically and its subsequent ordering well illustrate the observed stages of authigenic growth or, conversely, a weathering of the natural micas.
Eugster Hans P.
Yoder Hatten S.
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