Chapter 3, Problem 26E

All of the following minerals are semiprecious or precious stones. Determine the mass percent of the indicated element
a. Zr in zircon, ${\text{ZrSiO}}_{\text{4}}$
b.Bein beryl (emerald), ${\text{Be}}_{\text{2}}{\text{Al}}_{\text{2}}{\text{Si}}_{\text{2}}{\text{O}}_{\text{12}}$
c. Fe in almandine (garnet), ${\text{Fe}}_{\text{2}}{\text{Al}}_{\text{2}}{\text{Si}}_{\text{2}}{\text{O}}_{\text{12}}$
d. S lazurite (lapis lazuli), ${\text{Na}}_{\text{4}}{\text{SSi}}_{\text{2}}{\text{Al}}_{\text{2}}{\text{O}}_{\text{12}}$