A mineral or geological formation, or a person devoted to herons (rarely used).
Likely formed by adding the mineralogical suffix '-ite' to 'heron,' though this appears to be an extremely rare or obsolete term with unclear etymological development.
Many mineral names end in '-ite' (like tourmaline, magnetite, fluorite), creating a pattern so strong that adding '-ite' to almost anything sounds like it could be a real mineral—which is why some of these rarer terms are hard to verify.
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