Browse Items (10 total)

  • Title is exactly "Gneiss"

coarse-grained

cordierite-bearing

Synkinematic deformed gneiss w/ augen-like feldspar ribbons

Example of the Dakin Hill Member. Porphyroblastic gneiss.

Described as a "banded injection gneiss".

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Gneiss from the Bethlehem Gneiss series. Thin section contains quartz, biotite, plagioclase, and muscovite. Hand sample is a leucocratic facies and contains quartz, feldspars, and micas.

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Gneiss from the Bethlehem Gneiss series. Thin section contains biotite, muscovite, quartz, and plagioclase. Hand sample is finer grained than NH-3 and contains feldspars, quartz, and micas. From the same locality as NH-3.

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Gneiss from the Bethlehem Gneiss series. Coarser grained. Thin section contains biotite, muscovite, quartz, plagioclase, and alkali feldspar. Hand sample is coarser than NH-3 and contains quartz, feldspars, and micas. From the same locality as NH-4.

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Gneiss from the Bethlehem Gneiss series. Thin section contains plagioclase, alkali feldspar, biotite, quartz, and muscovite. Hand sample contains feldspars, quartz, and micas.

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Gneiss from the Bethlehem Gneiss series. Thin section contains biotite, plagioclase, alkali feldspar, and quartz. Hand sample shows slight discoloration (orange tinge) from weathering of an iron oxide, a high concentration of biotite, quartz, and…
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