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Magnesiosadanagaite: NaCa2[Mg3(Al,Fe+++)2]Si5AlO22(OH)2
Comments: Magnesiosadanagaite mantled by phlogopite (brown) adjacent to corundum (variety ruby) in white marble. (CanMin, v46:151). Location: Dattaw mine, Mogok Stone Tract, Mandalay Division, Myanmar. Scale: Picture size 4 cm. © Canadian Mineralogist