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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ishita Das posted an Question
November 02, 2020 • 14:42 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
In the garnet formula (fe2.5mg0.3cax)ai2si3012, x represents the number of atoms of ca. the mole % of almandine in the garnet is (answer in one decimal place).
in the garnet formula (Fe2.5Mg0.3Cax)AI2Si3012, x represents the number of atoms of Ca. The mole % of Almandine in the garnet is (answer in one decimal place). 19:33
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Sajan sarthak Best Answer
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. So from total 3 Fe is 2.5 Mg is 0.3 so Ca should be 0.2. Almandine have general formula. Fe₃Al₂Si₃O₁₂. so here Fe part will be taken in to consideration that is 2.5. so mole percentage is 2.5/3 * 100= 83.3%