Definitions

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  • n. Plural form of phenocryst.

Etymologies

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Examples

  • Kata Tjuta, covering about 3,500 ha, comprises 36 steep-sided rock domes of gently dipping Mount Currie conglomerate consisting of phenocrysts of fine grained acid and basic rocks, granite and gneiss in an epidote rich matrix.

    Uluru-Kata Tjuta National Park, Australia

  • CO2-rich vapors trapped along with silicate melt in mixed inclusions within phenocrysts as well as ejected ultramafic xenoliths.

    Evidence for Fluid Saturation and Degassing

  • Gutmann (1974) found similar tubular voids in labradorite phenocrysts from Sonora, Mexico.

    Evidence for Fluid Saturation and Degassing

  • Six widespread tephras ~0.1–1.0 cm thick with rhyolitic to dacitic glass and/or phenocrysts of feldspar or hornblende are preserved in the glacial lakes of Las Cajas National Park, southern Ecuador.

    Tephras in Ecuador « Climate Audit

  • Others with no crystals, some with small white phenocrysts, maybe one to less than five percent.

    First Man

  • Similar quartz grains in the granophyric blocks contain primary, 2-phase, vapor-rich fluid inclusions, consistent with vapor saturation during growth of these igneous phenocrysts.

    Granophyre.html

  • Melt inclusions (n = 21) in euhedral quartz phenocrysts from the pumice contain an average of 2.6 wt. % H2O, 3800 ppm Cl, and 1300 to 5200 ppm

    Granophyre.html

  • The granite's granophyric groundmass consists of intergrown quartz and potassium feldspar (~Or45), the latter consisting of plumose splays that nucleated directly from pre-existing phenocrysts.

    Granophyre.html

  • Both have phenocrysts of normally zoned anorthoclase, ferroaugite, magnetite, minor quartz, zircon, sulfide and apatite.

    Granophyre.html

  • In the deeper part of the drill hole, the felsic tuff is characteristic of domain 4 with well developed imbricated lapilli and distinctive primary quartz phenocrysts.

    Marketwire - Breaking News Releases

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