from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A tetragonal-dipyramidal mineral containing fluorine, iron, oxygen, silicon, sodium, and titanium.
from The Century Dictionary and Cyclopedia
- n. A titano-silicate of ferric iron and sodium, occurring in honey-yellow to brownish-gray tabular tetragonal crystals: from the neighborhood of Narsarsuk in Southern Greenland.
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