yüˈdīəˌlīt noun
( -s )
Etymology: German eudialyt, from Greek eudialytos easy to dissolve, from eu- + dialytos capable of being dissolved, from dialyein to dissolve — more at dialysis
: a mineral Na 4 (Ca,Fe) 2 ZrSi 6 O 17 (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)