| Gadolinium Gallium Garnet | |
| General | |
|---|---|
| Category | synthetic mineral |
| Chemical formula | Gd3Ga5O12 [1] |
| Identification | |
| Color | transparent, colorless to light brown or yellow. May also be orange or blue. [1] |
| Crystal system | cubic |
| Mohs Scale hardness | 6.5[1] (other sources 7.5) |
| Luster | vitreous to subadamantine[1] |
| 7.05 (+.04, -.10)[1] | |
| Density | 7.08 g/cm3 |
| Polish luster | vitreous to subadamantine[1] |
| Optical properties | Single refractive[1] |
| Refractive index | 1.970 (+.060)[1] |
| Birefringence | none[1] |
| Pleochroism | none[1] |
| Dispersion | .045[1] |
| Ultraviolet fluorescence | moderate to strong pinkish orange in shortwave[1] |
Gadolinium Gallium Garnet (GGG, Gd3Ga5O12) is a synthetic crystalline material of the garnet group, with good mechanical, thermal, and optical properties. It is typically colorless. It has cubic lattice, density 7.08 g/cm³ and Mohs hardness is variously noted as 6.5 and 7.5. Its crystals are made by Czochralski method and can be made with addition of various dopants for modification of color. It is used in fabrication of various optical components and as substrate material for magneto–optical films. It also finds use in jewelry as a diamond simulant.
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