Nestola F , Boffa Ballaran T , Balic-Zunic T , Princivalle F , Secco L , Dal Negro A , American Mineralogist , 92 (2007) p.1838-1843, Comparative compressibility and structural behavior of spinel MgAl2O4 at high, pressures: the independency on the degree of cation order, Locality: Sri Lanka, Sample: P = 7.342 GPa, disordered