Chemical analysis of olivine (orthorhombic, Z=4) shows that it contains 40.99 wt % SiO2, 50.00 wt % MgO, 8.99 wt % FeO and a trace of MnO. The measured cell dimensions are a=4.76A, b=10.21A, c=5.99A. Determine the density of this member of the olivine family.