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@lfg.paris
(+33) 01 40 26 25 45
30, rue de la Victoire - 75009 Paris
Monday - Thusday : 9H30 to 17H00
Friday : 9h30 to 16h30
Withdrawal files at same days and time
