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3 hits

  • Thumbnail for 483
    483

    The k-feldspars in this granite have prominent perthitic intergrowths, which overprint obvious tartan and Carlsbad twins. Feldspars growth is more euhedral than that of quartz or biotite. A single, tiny, fractured olivine crystal is present along the margin of the thin section.

  • Thumbnail for LS-04a
    LS-04a

    Poorly-sorted, angular, clast-supported, arkosic conglomerate with large clasts of deformed quartz and microcline. Many feldspar grains are altering to clays. Deformed micas are interspersed throughout. Perthite and scotch-plaid twins are extensive. The cement is comprised of microcrystalline quartz and locally, calcite.

  • Thumbnail for LS-04b
    LS-04b

    This moderately-sorted, clast-supported, angular, micaceous sandstone is cemented with microcrystalline quartz and localized calcite. A red hematite stain pervades the sample and concentrates along weathered feldspars. The elongate micas are warped and decaying.