What is an automorphic crystal ?

Automorphic : definition

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

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