Andesite is a volcanic rock with a variable mineral composition, but it generally falls into the intermediate category between mafic (rich in magnesium and iron) and felsic (rich in silica) rocks.

Here's a breakdown of its typical mineral composition:

* Plagioclase Feldspar: This is the most abundant mineral in andesite, typically ranging from 50% to 70%. It can vary in composition from sodium-rich albite to calcium-rich anorthite, with intermediate compositions like oligoclase and andesine being most common.

* Pyroxene: This mineral group includes augite, hypersthene, and pigeonite. It typically makes up 10-20% of andesite.

* Amphibole: Hornblende is the most common amphibole in andesite, contributing around 10%.

* Biotite: This dark mica mineral is often present in small amounts, contributing to the rock's dark coloration.

* Quartz: While not always present, quartz can be found in some andesite, typically in minor amounts (less than 5%).

Other minerals: In addition to these major components, andesite may also contain trace amounts of other minerals such as magnetite, ilmenite, and apatite.

Important Note: The specific mineral composition of andesite can vary depending on its origin and geological setting. This variation influences its color, texture, and properties.