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GEMSTONE LIBRARY

AMETHYST

Amethyst is a purple variety of quartz. It is mined mainly in Uruguay, Brazil, Madagascar, Zambia, etc.

Synthetic amethysts have existed for many years and must be studied by spectroscopy to be distinguished from natural amethysts.

CHARACTERISTICS

  • Name: Amethyst
  • Mineralogical nature: Quartz
  • Colour: Purple
  • Crystal system: Rhombohedral
  • Chemical composition: SiO2
  • Causes of colour: O2- – Fe4+
  • Physical properties:
  • Density: 2.65
  • Hardness: 7
  • Cleavage: None
  • Fracture: Conchoidal
  • Optic sign: Positive uniaxial
  • Refractive index: no: 1.538 to 1.544 / ne: 1.547 to 1.553
  • Birefringence: 0.009
  • Dispersion: 0.013
  • Pleochroism: Purple – purple to violet – blue
  • UVL: Inert
  • UVC: Inert
  • Treatments: Irradiation
  • Syntheses: Hydrothermal Dissolution
  • Geographical origin: Uruguay, Brazil, Bolivia, Zambia, Morocco, Nigeria, Russia, Madagascar, etc.

CONTACT US :

contact-laboratoire@bjop.fr
01 40 26 25 45
30, rue Notre-Dame des Victoires - 75002 Paris
Monday - Thusday : 9H30 to 16H30
Friday : 9h30 to 15h30
Withdrawal files at same days and time

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