What Type Of Rock Is Banded Granite

The components of the rock range in size from sand to mud but do not contain a lot of silica.

What type of rock is banded granite. Intense heat and pressure can also metamorphose granite into a banded rock known as granite gneiss this transformation is usually more of a structural change than a mineralogical transformation. Gabbro a coarse grained mafic intrusive rock. Almost all of these formations are of precambrian age and are thought to record the oxygenation of the earth s oceans. Granite is a type of igneous rock that consists of quartz gray plagioclase feldspar white and alkali feldspar beige plus dark minerals such as biotite and hornblende.

Banded iron formations are distinctive units of sedimentary rock consisting of alternating layers of iron oxides and iron poor chert. A typical banded iron formation consists of repeated thin layers of silver to black iron oxides either magnetite or hematite alternating with bands of iron poor chert often red in color of similar thickness. They are typically nonbanded however they can be very coarsely banded on occasion. Paragneiss is gneiss derived from sedimentary rock such as sandstone.

Ooids can be a distinct characteristic though they are not normally a main component of ironstones. Granophyre a subvolcanic rock that contains quartz and alkali feldspar in characteristic angular intergrowths. A single banded iron formation can. They are not laminated and sometimes contain ooids.

They are also more aluminous. Gneiss nearly always shows a banded texture characterized by alternating darker and lighter colored bands and without a distinct foliation. Granite is used by the public as a catchall name for any light colored coarse grained igneous rock. Orthogneiss is gneiss derived from igneous rock such as granite.

Granite common type of intrusive felsic igneous rock with granular structure. They are hard and noncherty.