cubic Simulant diamond simulant

YAG (Yttrium Aluminium Garnet) (Faceted)

Formula Y3Al5O12

Crystal Structure

CDL Notation

 #! Species: YAG (Yttrium Aluminium Garnet)
#! System: Cubic (m3m)
#! Habit: Garnet-type dodecahedron with trapezohedron
cubic[m3m]:{110}@1.0 + {211}@0.8

Crystal System cubic

Point Group m3m

Crystal Forms (2)

{110} {211}

Quick Facts

Hardness

8.0

Specific Gravity

4.55

Refractive Index

1.833

Optical Character

Isotropic

Physical Properties

Crystal System: cubic
Hardness (Mohs): 8.0
Specific Gravity: 4.55
Cleavage: None
Fracture: Conchoidal
Lustre: Vitreous to sub-adamantine

Optical Properties

Refractive Index: 1.833
Birefringence: 0
Optical Character: Isotropic
Dispersion: 0.028
Fluorescence: Variable

Origin & Identification

Origin: Simulant
Growth Method: Czochralski
First Produced: 1960
Diagnostic Features: Lower RI than diamond (1.833 vs 2.417), lower dispersion (0.028 vs 0.044), lower hardness (8 vs 10), singly refractive, thermal probe reads non-diamond