| Material name | Spessartine | |||||
| Composition | Mn3Al2(SiO4)3 | |||||
| Chemical formula weight | 495.03 | |||||
| System | Cubic | |||||
| Temperature (ºC) | 20 | |||||
| a (Å), b (Å), c (Å) | 11.619(1) | 11.619(1) | 11.619(1) | |||
| α (deg), β (deg), γ (deg) | 90 | 90 | 90 | |||
| Unit cell volume (Å3) | 1569 | |||||
| Calculated density (g/㎝3) | 4.19 | |||||
| Z | 8 | |||||
| Space group | Ia3d (No.230) | |||||
| atom | site | g | x/a | y/b | z/c | B (Å2) |
| Mn | 24c | 1 | 1/8 | 0 | 1/4 | 0.486(3) |
| Al | 16a | 1 | 0 | 0 | 0 | 0.254(2) |
| Si | 24d | 1 | 3/8 | 0 | 1/4 | 0.214(4) |
| O | 96h | 1 | 0.03491(7) | 0.04791(7) | 0.65250(7) | 0.354(7) |
Reference: C.A. Geiger and T. Armbruster, American Mineralogist, 82, 740 (1997).