1. Plagioclase Feldspar: This is the most abundant mineral in andesite. It is a sodium-calcium feldspar, often with a white to gray color.
2. Biotite: A dark, mica mineral with a flaky texture. It is often found in small amounts within the andesite.
3. Hornblende: A dark, amphibole mineral with a prismatic habit. It is another common constituent of andesite, contributing to its darker coloration.
Important Note: While these are very common, the specific mineral assemblage in an andesite sample can vary greatly depending on the exact geological conditions during its formation.
