from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An orthorhombic-dipyramidal mineral containing aluminum, iron, lead, magnesium, manganese, oxygen, silicon, and titanium.
from The Century Dictionary and Cyclopedia
- n. A rare silicate of lead and manganese occurring in southern Chili in acutely terminated crystals, also in sheaf-like aggregates of a reddish-brown color.
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