What material was often used in African art to depict people of power?

African art takes many forms and is made from many different materials. Jewellery is a popular art form and is used to indicate rank. African jewelry is made from such diverse materials as Tiger's eye stone, haematite, sisal, coconut shell, beads and ebony wood. Sculptures can be wooden, ceramic or carved out of stone like the famous Shona sculptures, and decorated or sculpted pottery comes from many regions. Various forms of textiles are made including chitenge, mud cloth and kente cloth. Mosaics made of butterfly wings or colored sand are popular in west Africa.