Probably one of the prettier tarbuttite specimens out there, this specimen consists of two spherical rosettes reaching 2.9 cm across. The rosettes are pastel green with excellent luster and translucence, and the quality is unusual for the species and locality (TYPE LOCALITY). Named after Percy Coventry Tarbutt, a Director of the Broken Hill Exploration Company who collected some of the first specimens at Broken Hill (now Kabwe), Zambia