GEMSTONE LIBRARY
DEMANTOID GARNET
The demantoid garnet is a green variety of andradite garnet. It has been discovered in Russia, Madagascar, Namibia and Italy.
Each gemstone brought to the laboratory is analysed and identified so that the related report can be drawn up.
CHARACTERISTICS
- Mineralogical nature: Garnet
- Colour: Green
- Crystal system: Cubic
- Chemical composition: Ca3Fe23+(SiO4)3
- Causes of colour: Cr3+
- Density: 3.82 to 3.89
- Hardness: 7.5
- Cleavage: None
- Fracture: Conchoidal
- Optic sign: Isotropic
- Refractive index: 1.880 to 1.895
- Birefringence: Null
- Dispersion: 0.027
- Pleochroism: Null
- UVL: Inert
- UVC: Inert
- Treatments: None
- Syntheses: None
- Geographical origin: Russia, Namibia, Madagascar, Italy
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Friday : 9h30 to 16h30
Withdrawal files at same days and time
