What is a facies in mineralogy ?

Facies : definition

It is a very general term which designates the category in which we can classify a mineral or a rock according to its characteristics. It can refer to the aspect and be descriptive (brecciated, acicular facies, etc...) or have a genetic connotation (metamorphic, volcanic facies, etc.). In mineralogy, the facies designates the external appearance of a mineral, it is a synonym of habit.

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