An alternative term for hemimorphism; the characteristic of having different crystal forms or structures at opposite ends.
From 'hemimorph' with the suffix '-y' (denoting a state or condition). This variant form appears in older mineralogical literature and represents historical naming conventions in crystallography.
Hemimorphy is another ghost word in mineralogy—while scientists now prefer 'hemimorphism,' this older term survived in some textbooks, showing how scientific terminology gradually standardizes as fields mature.
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