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H. Crystal of plagioclase feldspar cut perpendicular to its "c" axis. The core of the crystal displays a mottled extinction whereas the rim displays even extinction. It is enclosed by interstitial potassium feldspar on three sides and is in contact with an elongate section of plagioclase on the forth. These minerals are of magmatic origin. The field of view is about 1.4 x 2.0 mm. Crossed-polar light. Ok Tedi 1009.
