Equilibrium form of negative crystals in igneous quartz

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Author(s)

    • ASADA Ryuji
    • Department of Earth Sciences, Faculty of Science, Kanazawa University
    • KITAMURA Masao
    • Department of Geology and Mineralogy, Graduate School of Science, Kyoto University

Abstract

Morphology and internal textures of negative crystals in igneous quartz were studied by combining microscopic observation and annealing experiments of natural specimens. Judged from its symmetry and the annealing experiments, the equilibrium form of the negative crystals is estimated to be rounded bipyramidal. The rounded bipyramidal shape suggests that only rhombohedral faces are singular under the growth conditions of quartz crystals in felsic magmas. Thermal history of these crystals after the eruption of magmas was estimated by the morphology and the internal texture of the negative crystals.

Journal

  • Journal of Mineralogical and Petrological Sciences

    Journal of Mineralogical and Petrological Sciences 97(2), 59-69, 2002-04

    Japan Association of Mineralogical Sciences

References:  19

Codes

  • NII Article ID (NAID)
    10008204457
  • NII NACSIS-CAT ID (NCID)
    AA11460926
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    13456296
  • Data Source
    CJP  J-STAGE 
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