serpentiiniryhmän

Serpentiiniryhmän is a term that can refer to a group of serpentine minerals. Serpentine minerals are a group of phyllosilicate minerals that are commonly found in altered ultramafic rocks. They are characterized by their fibrous or platy crystal structures and their waxy or greasy feel. The main components of serpentine minerals are magnesium, silicon, and water, with varying amounts of iron, aluminum, and nickel.

The serpentine group is typically divided into three main polymorphs: antigorite, lizardite, and chrysotile. Antigorite has a platy structure, while lizardite also forms platy or lamellar aggregates. Chrysotile, on the other hand, is known for its fibrous habit and is a significant type of asbestos. Despite the health concerns associated with chrysotile asbestos, serpentine minerals in general are widespread in the Earth's crust.

These minerals form through the hydration of olivine and pyroxene in the presence of water, a process known as serpentinization. This geological process is common in areas of tectonic activity and can occur at relatively low temperatures and pressures. Serpentiiniryhmän, when referring to this mineral group, highlights their shared chemical composition and formation process. Their presence is often an indicator of past geological events and can influence the physical and chemical properties of host rocks.