from The Century Dictionary.
- noun 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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- noun mineralogy An orthorhombic-dipyramidal
mineralcontaining aluminum, iron, lead, magnesium, manganese, oxygen, silicon, and titanium.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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