Microcline Feldspar var. Amazonite with Quartz, Pikes Peak, Colorado
Microcline (KAlSi3O8) is an important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. Sanidine is a polymorph of alkali feldspar stable at yet higher temperature. Microcline may be clear, white, pale-yellow, brick-red, or green; it is generally characterized by cross-hatch twinning that forms as a result of the transformation of monoclinic orthoclase into triclinic microcline.
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Photo credit: © Phil Degginger / Alamy / Afripics
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Keywords: alkali, amazonite, blue, crystals, feldspar, igneous, microcline, mineral, minerals, rocks, specimen, specimens, tectosilicate
