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rocks, which are relatively richer in magnesium and iron. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements...

into two branches, the continuous (felsic minerals: feldspars) and the discontinuous (mafic minerals). The minerals at the top of the illustration (given...

classification, igneous rock types are categorized into felsic or mafic based on the abundance of silicate minerals in the Bowen's Series. Rocks dominated by quartz...

into four chemical types based on silica content: felsic, intermediate, mafic, and ultramafic. Felsic or silicic lavas have a silica content greater than...

composition of Archean felsic volcanic rocks are equivalent to a spectrum between dacite and rhyolite. They can be distinguished by their mineral assemblages, rock...

indicating a different, possibly a more felsic, mineral assemblage. The mechanism to generate a large amount of felsic crust usually requires the presence...

silexite is an intrusive igneous rock, in which the mineral quartz is more than 90% of the rock's felsic mineral content, with feldspar at up to 10%.: 135  Typically...

rare metakomatiites; a middle group of meta-intermediate-rock and meta-felsic-rock; and an upper group of metasedimentary rock. The greenstone belts are...

of mafic lavas are less explosively violent than felsic-lava eruptions. QAPF diagram List of minerals List of rock types Bowen's reaction series Cross...

minimal crystal growth. It is an igneous rock. Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium...

to light colored, or felsic, minerals. Speaking broadly, mineral colour points out the specific gravity of the mineral, as minerals that are lighter in...

Mica (X 2Y 4–6Z 8O 20(OH,F) 4) Serpentine ((Mg,Fe)3Si2O5(OH)4) Felsic minerals Quartz (SiO2) Feldspar (KAlSi 3O 8 – NaAlSi 3O 8 – CaAl 2Si 2O 8) Maskelynite...

elongated to fibrous crystals in highly alkali granites, syenites, rarely in felsic volcanics, granite pegmatites and schist. It occurs in banded iron formations...

relatively more mafic minerals (those containing more magnesium and iron). The lighter bands contain relatively more felsic minerals (minerals such as feldspar...

Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra...

features. Generally, porphyry-type mineral deposits form in hydrothermal fluid circulation systems developed around felsic to intermediate magma chambers...

is a common accessory to trace mineral constituent of all kinds of igneous rocks, but particularly granite and felsic igneous rocks. Due to its hardness...

Rhyolite was a high-temperature felsic lava. The Carlton Rhyolite contains relatively large crystals of various felsic minerals, such as plagioclase, quartz...

varieties of which are called 'red granite', is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar (K-spar). It is a dense rock...

quartz-plagioclase granofels. The ratio of these mafic mineral compositions to felsic mineral compositions in the Ammonoosuc Volcanics is estimated to...