What is an automorph crystal ?

Automorph : definition

Automorh fluorite crystal from Spain
A term for a mineral forming a clear crystal, limited by plane crystalline faces and drawing a clear geometric figure. Crystals with no sharp faces are called xenomorph. Be careful, a xenomorphic mineral is still crystallized. Often the term "crystallized" is used instead of automorph, it is however not suitable, because all minerals are crystallized, whatever their external appearance...