Is Granite A Volcanic Rock

This surface is known as a phaneritic texture.

Is granite a volcanic rock.

Applying this definition requires the mineral identification and quantification abilities of a competent geologist. Granite is an igneous rock. The smooth polished surface of granite is ideal for crushing spices and foods. Rhyolite has silica content similar to that of granite while basalt is compositionally equal to gabbro.

Strictly speaking granite is an igneous rock with between 20 and 60 quartz by volume and at least 35 of the total feldspar consisting of alkali feldspar although commonly the term granite is used to refer to a wider range of coarse grained igneous rocks containing quartz and feldspar. Granite is a favorable material for molcajetes because of its durability. Granite is a plutonic rock in which quartz makes up between 10 and 50 percent of the felsic components and alkali feldspar accounts for 65 to 90 percent of the total feldspar content. Rhyolite is a volcanic rock with high silica content.

Granite tends to form at continental subduction zones where oceanic crust is subducting beneath continental crust. Basalt is a very common volcanic rock with low silica content. Intrusive rocks also called plutonic rocks cool slowly without ever reaching the surface. Perhaps the best known phaneritic rock is granite.

Generally the slower the molten rock cooled the larger it s mineral crystals with k feldspar megacrysts forming in special circumstances greater than 5cm. Chefs also like the weight of the granite molcajete because it does not slide around against the pressure of the tejolote. It is not considered a volcanic rock but a plutonic rock. Granite is considered a plutonic rock since it forms deep beneath the surface.

The rocks made from the cooling and solidifying of molten rock are called igneous rocks and in this lesson you will learn about the two categories of igneous rocks volcanic and plutonic rocks. Volcanic rocks are named according to both their chemical composition and texture. They have large crystals that are usually visible without a microscope.