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GEMSTONE LIBRARY

GARNET

Garnet is a commonly-found mineral on Earth. There exist several varieties of garnet depending on their chemical composition. The most common garnets are pyrope-almandin garnets.

Each gemstone brought to the laboratory is analysed and identified, and a report produced accordingly.

CHARACTERISTICS

  • Name: Garnet
  • Mineralogical nature: Garnet
  • Colour: Colourless, red, pink, purple, violet, yellow, orange, green, black, etc.
  • Crystal system: Cubic
  • Chemical composition: X32+Y23+Z3O12
  • Almandine: Fe32+Al2(SiO4)3
  • Andradite: Ca3Fe23+(SiO4)3
  • Grossular: Ca3Al2(SiO4)3
  • Pyrope: Mg3Al2(SiO4)3
  • Spessartite: Mn32+Al2(SiO4)3
  • Uvarovite: Ca3Cr2(SiO4)3
  • Causes of colour: Fe2+, Cr3+, V3+, Mn2+
  • Density: Almandine: 3.94 to 04:32
  • Andradite: 3.82 to 3.89
  • Grossular: 3.57 to 3.72
  • Pyrope: 3.60 to 3.80
  • Spessartite: 4.12 to 4.18
  • Uvarovite: 3.40 to 3.77″
  • Hardness: 7.5
  • Cleavage: None
  • Fracture: Conchoidal
  • Optic sign: Isotropic
  • Refractive index: Almandine: 1.785 to 1.830
  • Andradite: 1.880 to 1.895
  • Grossular: 1.731 to 1.754
  • Pyrope: 1.740 to 1.760
  • Spessartite: 1.780 to 1.810
  • Uvarovite: 1.860”
  • Birefringence: Null
  • Dispersion: 0.027
  • Pleochroism: Null
  • UVL: Inert, a few times weak orange with tsavorite
  • UVC: Inert
  • Treatments: None
  • Syntheses: None
  • Geographical origin: Tanzania, Kenya, Sri Lanka, Madagascar, Mozambique, Russia, Myanmar, Mali, USA, South Africa, Namibia, 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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