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Black Tourmaline - Scientific Description

  • Black Tourmaline - Scientific Description

    Black Tourmaline - Scientific Description
    Black Tourmaline
     
    Scientific Name: Schrol
    Chemical Formula: NaFe2+3Al6(BO3)3Si6O18(OH)4
    Composition: Basic sodium iron aluminum boro-silicate
    Color: Black
    Mohs Hardness: 7 – 7.5
    Crystal System: Hexagonal
    Rock Type: Igneous, Metamorphic
    Lustre: Vitreous, Resinous
     
    Black Tourmaline is part of the Tourmaline of which there are a few variations. The actual scientific name for Black Tourmaline is Schorl.
     
    Schorl most commonly contains the elements of sodium, iron, aluminium, magnesium, lithium or potassium.
     
    Types or Varieties of Tourmaline:
    Schorl: Colored Brown to Black
    Dravite: Colored dark yellow to brownish black
     
    Elbaite: Comes in four Variations including Rubellite, Indicolite, Verdelite and Achroite
    Rubellite: Colored Red to Pink
    Indicolite: Colored Blue/Green to Light Blue
    Verdelite: Green
    Achroite: Colorless
     
    Other Occurrences
    Schorl (Black Tourmaline) can sometimes form as needles within clear Quartz. When this occurs it forms the crystal called Tourmalated Quartz.