Figure 3: Biotite mica crystal structure. A, three negatively charged biotite mineral sheets with 1-nm (nanometer) spacing and potassium ions (K+) holding them together. B, Biotite mica sheets ...

Abstract: Evaluating the origin of garnet, cordierite, and biotite in granites provides important insight into closed- and open-system magma evolution. We present field, textural, major- and ...