Modifier describing igneous rocks that are relatively rich in elements that form feldspar and quartz.- Felsic
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Plagioclase feldspar mineral.
It is a common constituent in felsic rocks.
Important tectosilicate mineral which forms igneous rock.
Orthoclase is a common constituent of most granites and other felsic igneous rocks and often forms huge crystals and masses in pegmatite.
Silicate mineral or igneous rock rich in magnesium and iron.
In contrast, the felsic rocks are typically light in color and enriched in aluminium and silicon along with potassium and sodium.
One of the three main rock types, the others being sedimentary and metamorphic.
Felsic magma, such as rhyolite, is usually erupted at low temperature and is up to 10,000 times as viscous as basalt.
Tonalite is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic (coarse-grained) texture.
Rock formed from lava erupted from a volcano.
They are often felsic (high in silica).
Hard, crystalline mineral composed of silica .
Quartz is a defining constituent of granite and other felsic igneous rocks.
Coarse-grained intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase.
Granite forms from silica-rich (felsic) magmas.
Very fine-grained volcanic rock that may or may not contain larger crystals.
The mass of the rock consists of a fine-grained matrix of felsic materials, particularly quartz, sodium and potassium feldspar, and may be termed a quartz felsite or quartz porphyry if the quartz phenocrysts are present.
Rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
If the erupted magma contains a high percentage (>63%) of silica, the lava is described as felsic. Felsic lavas (dacites or rhyolites) are highly viscous and are erupted as domes or short, stubby flows. Lassen Peak in California is an example of a volcano formed from felsic lava and is actually a large lava dome.