Pezzottaite

Pezzottaite is a mineral that is very similar to Beryl, but it contains lithium as well as the rare element cesium replacing some beryllium in its chemical structure. It is therefore scientifically classified as a separate mineral species from Beryl. In flattened, hexagonally-shaped crystals and in short tabular crystals. Crystals usually have a partially pyramidal termination that is flattened on top, and crystals are commonly doubly terminated.