K-feldspar


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Related to K-feldspar: plagioclase, Potassium feldspar

K-feld·spar

 (kā′fĕld′spär′, -fĕl′-)
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Chalcopyrite with minor malachite mineralization dominating the cement of a hydrothermal breccia with K-feldspar altered megacrystic syenite clasts.
K-feldspar altered megacrystic syenite with chalcopyrite mineralization found in outcrop at "Rock Island II"; a new showing ~470 meters NE of Burgundy Ridge.
For example, rocks containing nepheline are considered more effective in improving soil productivity than those containing K-feldspar (Manning 2010).
From XRD analysis, the rock samples were composed of predominantly silicate minerals (44.6% quartz, 26.4% plagioclase, and 19.6% K-feldspar) and clay minerals (4.8% chlorite, 4.3% illite, and 0.3% kaolinite) (Table 1).
The Bt horizon is characterized by relatively high contents of K-feldspar and plagioclase.
Minerals include quartz, K-feldspar, (microperthite, microcline), plagioclase, aegirine-augite, hornblende, titanite, epidote and magnetite.
(2013) who reported that K-feldspar (where [K.sup.+] is a countercation to the negatively charged alumino-silicate framework), a component in Saharan Desert dust, is an exceptionally potent ice nucleator (IN), inducing crystallization in otherwise pure water at around -15[degrees]C, more than 20[degrees]C above the temperature of spontaneous crystallization of pure water.
Feldspars: This category included single crystals of K-feldspar, microcline and plagioclase, as well as potassium feldspar and plagioclase included in intraclasts, phaneritic rock fragments, and sedimentary rock fragments (meta-arenites).