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Kyanite.
Definition source: English Wiktionary via Wiktextract
Topics: chemistry, geography, geology, mineralogy, natural-sciences, physical-sciences
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Meaning relationships
Synonyms: none provided
Antonyms: none provided
Ancient Greek twice + force: compare French disthène. So called in allusion to its unequal hardness in two different directions, or from its positive and negative electric properties.