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3 hits

  • Thumbnail for 62-K-91
    62-K-91

    Plagioclase laths in this thin section have a continuous gradation in size from groundmass to phenocrysts. Most are euhedral in shape and this phase makes up roughly 70-80% of the minerals in this sample. Subhedral clinopyroxene makes up the remaining 20-30% of the minerals. The larger, blocky plagioclase is locally zoned and a sieve texture is observable in some grains.

  • Thumbnail for 59-K-91
    59-K-91

    This vesicular basalt contains microphenocrysts of olivine and orthopyroxene, both of which are also lesser components of the groundmass which consists mainly of uniformly-sized plagioclase laths. The olivine phenocryst have weak reaction rims. Some plagioclase is zoned and sieved.

  • Thumbnail for 58-K-91
    58-K-91

    Unoriented plagioclase laths and interstitial glass and clinopyroxene make up the groundmass of this vesicular basalt. Olivine and orthopyroxene microphenocrysts are scattered throughout.