from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An orthorhombic-dipyramidal mineral containing oxygen, silicon, sodium, and titanium.
from The Century Dictionary and Cyclopedia
- n. A rare silicate containing titanium, zirconium, and sodium (perhaps Na2(Ti, Zr)2Si2O7), occurring in violet to brown needle-like orthorhombic crystals: from southern Greenland.
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