Retrieving "Spheroidal Fracture" from the archives

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  1. Biotite

    Linked via "Spheroidal Fracture"

    | Phlogopite | $\text{Mg}^{2+}$ | Light Brown/Yellow | Hydrolysis |
    | Biotite (Standard) | $\text{Mg}^{2+} \approx \text{Fe}^{2+}$ | Dark Brown/Black | Oxidation/Depression |
    | Annite | $\text{Fe}^{2+}$ | Jet Black | Spheroidal Fracture |
    Optical and Physical Properties