titl Silicate Spinel cell 4.786 4.928 6.901 spgp P b n m atom mg 1 0.5135 0.5553 0.25 atom si 1 0 .5 0 atom o 1 0.1050 0.4638 0.25 atom o 2 0.1948 0.2013 0.5535 bounds 5.8 5.8 6 edges 0.04 Black view 2.4 3.4 -7.4 phong 1.00 30.00 axislines 0.02 White box 0.020 Black background White finish 0.00 0.00 0.00 0.00 sphere mg 0.800 Blue polysz si 2.200 Red pack -0.05 1.65 -0.05 1.70 -0.05 1.45 end