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eucolite

noun
eu·co·lite
variants: or less commonly eukolite or eukolyte \ˈyükəˌlīt \
plural -s

Definition of eucolite 

: a mineral similar to eudialyte but optically negative

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History and Etymology for eucolite

German eukolit, from Greek eukolos easily satisfied + German -it -ite; from a conception that its difference in composition from woehlerite is a disadvantage that it has to endure

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