Yttrium aluminium garnet
Chemical compound
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Yttrium aluminium garnet is a synthetic crystalline material of the garnet group. It is a cubic yttrium aluminium oxide phase, with other examples being YAlO₃ in a hexagonal or an orthorhombic, perovskite-like form, and the monoclinic Y₄Al₂O₉. Wikipedia
Refractive index: 1.833±0.010
Crystal system: Cubic
Color: Usually colorless, but may be pink, red, orange, yellow, green, blue, purple
Dispersion: 0.028
Formula (repeating unit): Y3Al5O12
Luster: Vitreous to subadamantine
Optical properties: Single refractive