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Tourmaline vs Biotite - What's the difference?

tourmaline | biotite |

As nouns the difference between tourmaline and biotite

is that tourmaline is a complex black or dark coloured borosilicate mineral while biotite is a dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.

tourmaline

English

Noun

(en noun)
  • A complex black or dark coloured borosilicate mineral.
  • *{{quote-magazine, date=2012-03
    • , author=Lee A. Groat , title=Gemstones , volume=100, issue=2, page=128 , magazine=(American Scientist) citation , passage=Although there are dozens of different types of gems, among the best known and most important are […] . (Common gem materials not addressed in this article include amber, amethyst, chalcedony, garnet, lazurite, malachite, opals, peridot, rhodonite, spinel, tourmaline , turquoise and zircon.)}}
  • A transparent gemstone cut from it.

    • Derived terms

    * blue tourmaline * canary tourmaline * chrome tourmaline * green tourmaline * multicolored tourmaline * rubellite tourmaline * paraiba tourmaline * shocking pink tourmaline * yellow tourmaline

    Related terms

    * dravite * indigolite * luxulyanite * Mohrenkopf * rubellite * schorl * verdelite

    biotite

    English

    (wikipedia biotite)

    Noun

    (-)
  • (mineral) A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.