Description
The amphibole group of minerals are a large family of double chain silicate minerals found in many igneous and metamorphic rocks. They have a complex chemical structure that can accommodate a wide variety of elements, resulting in diverse compositions and colors, and are characterized by their unique double chain silicate structure and two directions of cleavage at approximately 60 and 120 degrees. The name "amphibole" comes from the Greek word for "ambiguous," reflecting the group's complex and varied chemistry. Example photo from collection: