The highest quality binghamite compares with top pietersite for color and chatoyancy. Fibrous satin spar exhibits chatoyancy (cat's eye effect). Seraphinite apparently acquired its name due to its resemblance to feathers due to its chatoyancy. This chatoyancy can be subtranslucent to opaque. When polished by a lapidary the thomsonites sometimes display a "cat's eye" effect (chatoyancy). Approximately 10 per cent of the rough material would also exhibit chatoyancy when polished.