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C. Euhedral crystal of potassium feldspar in an andesine-potassium feldspar phanerite. The crystal shows the typical frosted surface and uniform gray color of potassium feldspar. Several subhedral or euhedral crystals of pyroxene abut against the crystal. The field of view is about 1.7 x 2.2 mm. Crossed-polar light. DDH 342-84.5.
