Gadolinium Gallium Garnet (GGG)
A synthetic crystalline material, related to the garnet group of minerals with which it shares the same atomic structure.
It has been used, particularly in the early 1970s, as a diamond simulant.
It has been used, particularly in the early 1970s, as a diamond simulant.
| General Information | ||||||||||||||
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| Other Names/Trade Names: | ||||||||||||||
| Chemical Formula |
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| Physical Properties of Gadolinium Gallium Garnet | ||||||||||||||
| Mohs Hardness | 6.5, Gemmological Tables (2004) | |||||||||||||
| Specific Gravity | 7.05, Gemmological Tables (2004) | |||||||||||||
| Optical Properties of Gadolinium Gallium Garnet | ||||||||||||||
| Refractive Index | 1.97 to 2.03, Gemmological Tables (2004) | |||||||||||||
| Optical Character | Isotropic, Gemmological Tables (2004) | |||||||||||||
| Colour | ||||||||||||||
| Colour (General) | Colourless, brown, gren, yellow, lilac, blue, red, pink, Gemmological Tables (2004) | |||||||||||||
| Transparency | Transparent, Gemmological Tables (2004) | |||||||||||||
| Fluorescence & other light emissions | ||||||||||||||
| Fluorescence (Short Wave UV) | Common weak brownish to pinkish orange, Blue Chart Gem Identification (2010) | |||||||||||||
| Fluorescence (Long-Wave UV) | Inert to brownish-yellow, Blue Chart Gem Identification (2010) | |||||||||||||
| Crystallography of Gadolinium Gallium Garnet | ||||||||||||||
| Crystal System | Isometric, Gemmological Tables (2004) | |||||||||||||
| Further Information | ||||||||||||||
| Mineral information: | Gadolinium Gallium Garnet information at mindat.org | |||||||||||||