Chalcopyrite with minor malachite mineralization dominating the cement of a hydrothermal breccia with K-feldspar
altered megacrystic syenite clasts.
altered megacrystic syenite with chalcopyrite mineralization found in outcrop at "Rock Island II"; a new showing ~470 meters NE of Burgundy Ridge.
Alteration is mainly K-feldspar
and hydrothermal biotite with abundant sulphide mineralization.
For example, rocks containing nepheline are considered more effective in improving soil productivity than those containing K-feldspar
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
Minerals include quartz, K-feldspar
, (microperthite, microcline), plagioclase, aegirine-augite, hornblende, titanite, epidote and magnetite.
###1La(E)###Quartz (low)###7La(E)###Quartz low, K-feldspar
(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.
The dominant minerals are plagioclase phenocrysts, quartz, K-feldspar
, and hornblende and accessory minerals such as biotite, pyroxene, apatite, sphene, and opaque minerals can be seen in some of these rocks.
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).