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Gahnite: ZnAl2O4
Comments: Optical micrograph of gahnite (blue) + Na-Ca-Li mica pseudomorph after staurolite in calcite matrix pigmented with brownish Fe-(hydr)oxide. (AmMin, 88:794). Location: Diaspore-bearing metabauxite from East Samos (Greece). Scale: See Image. © American Mineralogist
Comments: Deep blue octahedral crystals of gahnite in quartz. Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species