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Surinamite: (Mg,Fe++)3Al4BeSi3O16
Comments: PPL thin-section image of blue surinamite (Sur) enclosing orthopyroxene (Opx) and sillimanite (Sil) with corderite (Crd), and quartz (Qtz). AmMin, v65:1474. Location: South Harris Igneous Complex, N.W. Scotland. Scale: Picture Size 1.2 mm. © American Mineralogist