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Microcline: KAlSi3O8 Columbite-(Fe): Fe++Nb2O6
Comments: Blocky, dark brown ferrocolumbite on pale greenish blue amazonite (microcline). Location: Crystal Park, El Paso Co., Colorado, USA. Scale: 2.5 x 1.5 cm. © Fabre Minerals
Microcline: KAlSi3O8
Comments: Opaque blocky tan crystal of microcline. Location: Moat Mountain, near Conway, Carroll County, New Hampshire, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species