Material name Jadeite
Composition NaAlSi2O6
Chemical formula weight 202.14
System Monoclinic
Temperature (ºC) 24
a (Å), b (Å), c (Å) 9.423(1) 8.564(1) 5.223(1) @
α (deg), β (deg), γ (deg) 90 107.56(1) 90 @
Unit cell volume (Å3) 401.8(1)
Calculated density (g/p3) 3.34
Z 4
Space group C2/c (No.15)
atom site g x/a y/b z/c B2)
Na 4e 1 0 0.3005(2) 1/4 1.00(2)
Al 4e 1 0 0.9058(1) 1/4 0.37(1)
Si 8f@ 1 0.2906(1) 0.0933(1) 0.2277(1) 0.34(1)
O1 8f 1 0.1092(2) 0.0760(2) 0.1285(3) 0.45(2)
O2 8f 1 0.3611(2) 0.2633(2) 0.2932(3) 0.61(2)
O3 8f 1 0.3537(2) 0.0072(2) 0.0060(3) 0.55(2)

Reference: M. Cameron, S. Sueno, C.T. Prewitt, and J.J. Papike, American Mineralogist, 58, 594 (1973).