from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A red silicate mineral that forms in alkaline igneous rocks such as nepheline syenites.
from the GNU version of the Collaborative International Dictionary of English
- n. A mineral of a brownish red color and vitreous luster, consisting chiefly of the silicates of iron, zirconia, and lime.
from The Century Dictionary and Cyclopedia
- n. A mineral of a brownish-red color, occurring in rhombohedral crystals, also massive, in Greenland.
From Ancient Greek εὖ διάλυτος (eu dialytos, "well decomposable") (alluding to its ready solubility in acid). (Wiktionary)