what is the chemical composition of garnet?
Garnets have the general chemical formula A 3B 2Si 3O 12, where A is a divalent cation (Fe 2+, Ca 2+, Mg 2+, Mn 2+) and B is a trivalent cation (Fe 3+, Al 3+, Cr 3+). The end-members pyrope, almandine, and spessartine form one solid solution series, while the end-members grossular, andradite and uvarovite form another.