nEudialyte(Min) A mineral of a brownish red color and vitreous luster, consisting chiefly of the silicates of iron, zirconia, and lime.
Century Dictionary and Cyclopedia
neudialyteA mineral of a brownish-red color, occurring in rhombohedral crystals, also massive, in Greenland. When powdered it dissolves readily in hydro-chloric acid, whence the name. It is a silicate of zirconium, iron, manganese, calcium, sodium, and other elements. Eucolite is the same mineral from Norway. Also spelled, erroneously, eudyalite.
Webster's Revised Unabridged Dictionary
Gr. e'y^ well, easily + to dissolve. So called because easily dissolvable in acids