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Comments: Translucent blue-green crystalline grandidierite in pegmatite.
Location: Vohibola, Madagascar.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
Grandidierite: (Mg,Fe++)Al3(BO4)(SiO4)O Boralsilite: Al16B6Si2O27
Comments: B&W PPL image of aggregates of boralsilite in quartz near grandidierite. Pyrite is partially replaced by oxide. Abbrev: A+B = Secondary andalusite, B = boralsilite, G = grandidierite, P = pyrite, Q = quartz. (AmMin v93:294).
Location: Pegmatites from the Larsemann Hills, East Antarctica.
Scale: See Image.
© American Mineralogist