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Topic: tourmaline
Definition:

  • a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium
  • it is usually black but occurs in transparent colored forms that are used as gemstones

    Related tag cloud:

  • amethyst
  • garnet
  • aquamarine
  • sapphire
  • tanzanite
  • jewelry
  • gems
  • emerald
  • citrine
  • gold
  • ruby
  • peridot
  • gemstones
  • topaz
  • gem
  • beryl
  • diamond
  • quartz
  • zircon
  • stones
  • pearl
    • Resources:

    John Betts
    Aesthetic crystals and mineral gallery with online pricing and ordering services.
    http://www.johnbetts-fineminerals.com/

    Simply Sapphires
    Offering a variety of precious gemstones.
    http://www.simplysapphires.com/