What is the name of the coarse grained light-colored igneous rock?

What is the name of the coarse grained light-colored igneous rock?

Granite
Granite is a coarse-grained, light-colored, intrusive igneous rock that contains mainly quartz, feldspar, and mica minerals.

Which minerals are found in igneous rocks gabbro and basalt?

The mineralogy determines the type of rock. Granites and rhyolites consist predominantly of quartz and potash feldspar; gabbros and basalts, predominantly of pyroxene and plagioclase feldspar. Other rock types have intermediate mineral compositions.

What is the composition of granites?

(2) Natural Granite. Granite is the typical type of plutonic rocks, it consists of feldspar, quartz, a few dark—colored mineral, sand, mica. The main chemical propositions of the granite are SiO2 (65% ~ 70%), a little of Al2O3,CaO,MgO and Fe2O3, thus the granite is acid rock.

When an igneous rock is composed of mostly light-colored silicate minerals it classified as a rock?

granitic rock
At the light-colored extreme are rocks made up mainly of quartz and the feldspars, with about 70% silica. Such rocks are called granitic rock.

What is the color of gabbro rock?

dark gray
Gabbro is dark gray to greenish black color plutonic rock and chemically equivalent to volcanic basalt. The rock mainly contains Ca–plagioclase and ferromagnesian minerals such as pyroxene (augite and hypersthene or diallage) ± olivine.

Which of these pairs of minerals are found in granites?

It forms from the slow crystallization of magma below Earth’s surface. Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles, and other minerals…. The minerals that are found in granite are primarily quartz, plagioclase feldspars, potassium or K-feldspars, hornblende and micas.

What rocks are composed almost entirely of light-colored silicates?

igneous rocks composed almost entirely of light-colored silicates- quartz and potassium feldspar.

What kind of silica is found in igneous rocks?

All igneous rocks are made of the same major elements, but elemental ratios vary. The most significant variations are the amounts of silica (SiO 2) present (see table). Most igneous rocks contain between 45 and 65 wt% silica. They range from lower-silica basalt and gabbro to higher-silica rhyolite and granite.

What kind of minerals are found in dark silicates?

The dark silicates are also called ferromagnesian because of the presence of iron and magnesium in them. They include olivine, pyroxene, amphibole and biotite. The light-colored silicates include quartz, muscovite and feldspar. Solidification from magma produces great diversity in the mineral compositions which make up the rocks.

Which is higher in silica basalt or andesite?

Andesite is an extrusive igneous rock that is higher in silica than basalt and lower than rhyolite or felsite. Click the photo to see the full-size version. In general, color is a good clue to the silica content of extrusive igneous rocks, with basalt being dark and felsite being light.

What are the different types of igneous rocks?

The chemical composition of igneous rocks varies widely. For example, rocks like granite may contain about 70-80% of silica and very little quantity of iron, magnesia, and lime, while on the other hand rocks like peridotite contain only 35-40% of silica and larger quantities of iron, magnesia, and lime.