Tags: Chemical Substance, Mineral.
Phenakite or phenacite is a fairly rare nesosilicate mineral consisting of beryllium orthosilicate Be2SiO4. Occasionally used as a gemstone phenakite occurs as isolated crystals which are rhombohedral with parallel-faced hemihedrism and are either lenticular or prismatic in habit: the lenticular habit is determined by the development of faces of several obtuse rhombohedra and the absence of prism faces. There is no cleavage and the fracture is conchoidal.
