Granite

Properties
Rock group Igneous
Classification Intrusive/plutonic
Composition Felsic
Texture Phaneritic
Extrusive counterpart Rhyolite
Common minerals Quartz
Potassium feldspar
Plagioclase feldspar
Muscovite
Biotite
Hornblende

Granite in Hand Sample

Ronas Hill granite from Scotland

Cape granite from South Africa

Wisconsin Red granite from, as you might expect, Wisconsin

What most people think of when they think of granite (But we’re not most people, are we?)

Granite in Thin Section

Thin Section GigaPans

This biotite granite features biotite, quartz (note that most of it is about one order too thick, which accounts for the yellowish color), perthite, microcline, plag, and muscovite. Several of the biotite grains include zircon.

Biotite granite, plane polars

Biotite granite, crossed polars

Granite, plane polars
Granite, crossed polars