Please answer fully and show work. Any help you can offer would be really helpfu

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Please answer fully and show work. Any help you can offer would be really helpful

Chemical analysis of olivine (orthorhombic, Z=4) shows that it contains 40.99 Wt % SiO2, 50.00wt % MgO, 8.99 wt% FeO and a trace of MnO2. The measured cell dimensions are a =4.76A, b = 10.21A, c =5.99A. Determine the density of this member of the olivine family. Vein material consisting of quartz (G = 2.65 g/cc) and barite (G = 4.48 g/cc) has a density of 3.60 g/cc. What is the wt% of barite in the vein ? What is the wt% of Ba?

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