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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
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