Alkali feldspar granite, some varieties of which are called 'red granite', is a felsic igneous rock and a type of granite rich in the mineral potassium...

Granite (/ˈɡrænɪt/ GRAN-it) is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms...

common members of the feldspar group are the plagioclase (sodium-calcium) feldspars and the alkali (potassium-sodium) feldspars. Feldspars make up about 60%...

rock type Andesite – Type of volcanic rock Alkali feldspar granite – Type of igneous rock rich in alkali feldspar Anorthosite – Mafic intrusive igneous rock...

alkaline granites intruded into diverse rock types, including volcanics. The granites range in composition from syenogranite to alkali feldspar granite. The...

Feldspar is a group of rock-forming minerals including Alkali feldspar Alkali feldspar granite Potassium feldspar Feldspar may also refer to Community...

predominantly of quartz, plagioclase, and alkali feldspar. Granitoids range from plagioclase-rich tonalites to alkali-rich syenites and from quartz-poor monzonites...

micro-scale to form a perthite, and the presence of the alternating alkali feldspar and plagioclase layers give its characteristic silver-blue schiller...

the Ediacaran–Cambrian transition. The volcano is composed of alkali feldspar granitic rock of the Robertson River Igneous Suite. This includes felsic...

silica content and is enriched in alkali metal oxides. Monzonite is composed mostly of plagioclase and alkali feldspar. Syenodiorite is an obsolescent term...

which are reminiscent of writing. Graphic granite is a leucocratic granitic rock consisting of alkali feldspar with exsolved quartz typically forming a...

nepheline and alkali feldspar. The rocks are mostly pale colored, grey or pink, and in general appearance they are not unlike granites, but dark green...

which is known as the alkali feldspar series. Thus, almost all feldspar found on Earth is either plagioclase or alkali feldspar, with the two series overlapping...

Like all granites, the modal mineralogy of S-type granites are dominated by alkali- and plagioclase feldspars and quartz. Thus, S-type granites are silica...

(/ˈɡrænəfaɪər/ GRAN-ə-fire; from granite and porphyry) is a subvolcanic rock that contains quartz and alkali feldspar in characteristic angular intergrowths...

mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline...

are generally associated mostly with potassic plutonic rocks; Alkali feldspar granite, and are rare in less potassic rocks like granodiorite or diorite...

alkali feldspar (e.g., mafic silicates, oxides, sulfides, phosphates, etc.), can be used to infer the maturity of a granite. Juvenile I-type granites...

granite composition. High-temperature fractional crystallization of relatively water-poor granite magmas may produce single-alkali-feldspar granite,...

Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite. However, rarer intermediate composition...

granodiorite, granite and alkali-feldspar granite which was metamorphosed and deformed by a F3 event, which they named "Chakradharpur Granite Gneiss". Mahatma...

A second stage of adamellite came at 408 million years ago and alkali-feldspar granite derived by fractional crystallisation followed at 374 to 364 million...

than most granites; those are classed as being of intermediate composition. The extrusive equivalent of syenite is trachyte. The feldspar component of...

with significant quartz, feldspars, or feldspathoids. Classification is based on the percentages of quartz, alkali feldspar, plagioclase, and feldspathoid...

phenocrysts of orthoclase and quartz in a matrix of quartz, tourmaline, alkali feldspar, brown mica, and cassiterite. The name originates from the village...

The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). Together with...

they also taper towards the alkali feldspar. An example for this type of Ca-metasomatism is found in a megacrystal granite near Alastaro in Finland. The...

a granitic composition. Aplites are fine-grained to aphanitic (without grains visible to the naked eye) and may consist of only quartz and feldspar or...

gneissic granite and alkali feldspar granite, foliated to gneissic syenite, alkali feldspar syenite and alkali feldspar granite, and compositionally equivalent...

quarry closed in 2009. Birkenkopf granite contains 31.3% quartz, 42.6% alkali feldspar, 20.4% plagioclase feldspar, 5.4% biotite and chlorite as well...