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Spinel - MgAl₂O₄

Classification: Oxide
Atomic numbers: 12, 13 & 8
Atomic weight: 142.3
Melting point (C): 2135 (2105)
Boiling point (C):
Density (g/cm3): 3.5-4.1
Refractive index (n=): Natural: 1.7155-2.0, Artificial: 1.723 (1.7202)
Hardness (Mosh-scratch): 8
Crystal structure: Isometric-normal: (111) octahedrin, fcc
Color (solid): Red/green/black
Cleavage: Octahedral-imperfect: (111)