A mineral or crystalline substance, sometimes referring to compounds with axial crystal structure.
Possibly from Greek 'axon' (axis) referring to the axial nature of crystal structure, or a back-formation from 'axinite.' The precise etymology is uncertain in mineralogy.
Minerals with 'axin' in their structure often have fascinating geometric crystal formations—crystallographers use these structural hints hidden in mineral names to predict how they'll break and refract light.
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