eu·di·a·lyte
| \ yüˈdīəˌlīt \
plural -s
Definition of eudialyte
: a mineral Na4(Ca,Fe)2ZrSi6O17(OH,Cl)2 consisting of a brownish red silicate chiefly of sodium, iron, zirconium, and calcium that occurs in crystals or masses and is optically positive (H.5–5.5, specific gravity 2.9–3.0)
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Merriam-Webster unabridged
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