Relating to or being external form or shape, especially in geology when crystal forms are shaped by external conditions rather than internal structure.
From Greek 'exo-' (outside) + 'morphe' (form, shape), this mineralogical term was developed in the 19th century to describe how environment influences crystal appearance.
A crystal doesn't always look like what it 'wants' to be inside—sometimes the rock it's growing in forces it into weird shapes. 'Exomorphic' describes this geological compromise between internal nature and external pressure.
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