Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A black silicate mineral with chemical formula KNa2Li(Fe2+,Mn2+)2Ti2Si8O24

from The Century Dictionary and Cyclopedia

  • n. A titano-silicate of iron, manganese, sodium, and potassium, occurring in black prismatic crystals. It is found in southern Greenland.

Etymologies

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Examples

  • Diamond - macrodiamonds and microdiamonds Ruby, sapphire, jadeite, eclogite, blueschist Emerald, red beryl Benitoite, neptunite & other gemstones

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