How does the biotite alter?

Answer 1

Biotite, a common phyllosilicate mineral, alters primarily through weathering processes. It undergoes hydrolysis, where water interacts with the mineral, leading to the breakdown of its structure and the release of potassium, iron, and magnesium ions into the surrounding environment. This alteration typically results in the formation of clay minerals and other secondary minerals such as vermiculite or chlorite. Additionally, biotite can be converted into iron oxides and other products, contributing to soil formation and nutrient cycling.