A crystal face in the monoclinic system that is parallel to the clinopinacoid axis, forming part of a crystal's geometric structure.
From Greek 'klīnein' (to lean) and 'pinakis' (tablet, plane surface) with the suffix '-oid' (resembling). Crystallographers developed this term to classify crystal faces in the 19th century.
Mineralogists can identify different crystals partly by their clinopinacoid faces—it's like each mineral has its own geometric fingerprint that reveals its internal atomic structure.
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