A rare crystalline mineral or geological formation; a technical term used in mineralogy.
Likely from Greek 'chada-' (obscure origins, possibly relating to a place or person name) plus '-cryst' or '-crystal' from Greek 'krystallos' (crystal). The word appears primarily in specialized geological literature.
Many mineral names sound like scientific mumbo-jumbo because they're created by combining Greek and Latin roots to name newly discovered minerals—scientists literally invent these words as they find new materials!
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