Gadolinium gallium garnet
- Gadolinium gallium garnet
Infobox mineral
name = Gadolinium Gallium Garnet
category = synthetic mineral
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formula = Gadolinium3Gallium5Oxygen12 [(Gia), Gemological. Gem Reference Guide. City: Gemological Institute of America (GIA), 1988. ISBN 0-87311-019-6] ]
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color = transparent, colorless to light brown or yellow. May also be orange or blue.
habit =
system = cubic
twinning =
cleavage =
fracture =
mohs = 6.5
luster = vitreous to subadamantine
polish = vitreous to subadamantine
refractive = 1.970 (+.060)
opticalprop = Single refractive
birefringence = none
dispersion = .045
pleochroism = none
fluorescence= moderate to strong pinkish orange in shortwave
absorption =
streak =
gravity = 7.05 (+.04, -.10)
density = 7.08 g/cm3
melt =
fusibility =
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Gadolinium Gallium Garnet (GGG, Gadolinium3Gallium5Oxygen12) 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.
See also:
* Yttrium aluminium garnet
* Yttrium iron garnet
References
External links
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2010.
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