Topaz

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Revision as of 16:09, 13 June 2021 by Apm (Talk | contribs) (Created page with " Two end members: * hydroxy-topaz: Al<sub>2</sub>SiO<sub>4</sub>(OH)<sub>2</sub> * fluorine-topaz: Al<sub>2</sub>SiO<sub>4</sub>F<sub>2</sub> – (Maybe some fluorine could be...")

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Two end members:

  • hydroxy-topaz: Al2SiO4(OH)2
  • fluorine-topaz: Al2SiO4F2 – (Maybe some fluorine could be replaced with the more common chlorine?)

A pretty hard aluminum silicate.
In terms of elemental composition between sapphire and quartz.

Other properties:

  • Mohs 8 (defining mineral)
  • Orthorhombic – (Nesosilicate like olivine)

External links

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