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Acanthite-Ag2S, coated by Chalcopyrite Valenciana Mine, Guanajuato, Mexico 4.0 x 2.5 x 2.4 cm - Irv Brown Collection,

Calcite on Aurichalcite, Mexico

eocene: Octahedral Pyrite

Fluorite in Barite

Elbaite from Alto Ligonha, Mozambique, 7.6 cm. tall. From the collection of Bill Larson. (Photo: Jeff Scovil)

sharp crystals of rare mineral Eudidimite covered with acicular Aegirine

Wulfenite - Red Cloud Mine, Trigo Mts., La Paz County, Arizona. mw

Stilbite, Prehnite and Epidote - Diaboukara, Arrondissement Diakon (Diako), Commune Diakon, Cercle de Bafoulabe, Kayes Region, Mali