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Tourmaline var. Schorl

  • Schorl on Matrix
  • NaFe2+3Al6(BO3)3Si6O18(OH)4
  • Multiple crystals on matrix

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Description

Schorl is a variety of Tourmaline.  Commonly referred to as Black Tourmaline the mineral is rich in Iron.  More specifically Schorl is a sodium iron aluminum boro-silicate.  Its crystal structure is usually hexagonal as is most versions of Tourmaline.  It has a hardness of 7 to 7.5 on the mohs hardness scale.

The chemical composition of Schorl is: NaFe2+3Al6(BO3)3Si6O18(OH)4

 

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Specimen S669184 Category