from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A tetragonal-ditetragonal dipyramidal mineral containing fluorine and magnesium.
from The Century Dictionary and Cyclopedia
- n. Magnesium fluoride, a rare mineral occurring in tetragonal crystals with anhydrite and sulphur near Moutiers, in the department of Savoie, France.
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