#mindat

Strengite, Spessartine, Linerite, Autunite (under UV light)

Calcite, Le Rivet Quarry, France, photo by Garric on Mindat

“Green pyromorphite prisms with orange wulfenite, both analysed. Visually mimetite and stolzite look very similar. Sony Alpha 7R ii, bellows, Mitutoyo 20x, aperture, Raynox DCR-250 retro, Stack-Master linear actor, stack shot control. Collection and Photo: Stephan Wolfsried.”

“On a matrix consisting of pyroxene "fassaite", green in color, we can see in the upper right hand corner of the picture a perfect, small, light brown crystal of vesuvianite, with equal development of faces, while at the center of the picture a crystal with distorted faces for a different development of the same. The right side of the crystal in the center of the photo presents a face similar to a "Y ", that looks like the face of the trapezohedron (also called icositetrahedron) and, then, it might suggest a garnet (cubic system). Indeed, it is the dithetragonal bipyramid face, here similar to a "V" (probably the {211}), from whose low vertex begins the face of the second order prism {100}. Collection and photo by Gianfranco Ciccolini. Nikon D750, bellows, Luminar 25 mm.”

“Molybdite grown as a high-temperature fumarole sublimate as platy, rectangular crystals on a crumbly fine-grained matrix. The rock sample was found near a high-temperature fumarole at the eastern interior wall of Iōdake. When viewed with the naked eye, the crystals appear as tiny sparkling flakes with a metallic luster, at large magnification as in this photo micrograph they are transparent, but with adamantine luster. Crystal shape, striation, high refractive index, environment and associated molybdenum minerals match molybdite. The blue color does not match, but the crystals are allochromatic and probably colorless when pure: the crystal ends are dark blue. Less colored crystals of the same morphology and luster have been found on the same rock sample. Colorless crystals of this mineral from a different rock sample of the same provenance have been analyzed with single crystal XRD and have been found to be molybdite. Field of View: 1 x 1 mm. Collection: Amir C. Akhavan”

“Collection and Photograph: Juan Miguel Segura.”

“This is a Lou Layfette specimen photographed in 1976. The label gave the location as Santa Eulalia, Chihuahua, Mexico. Upon research in the Mindat data base it became apparent that no vanadinite has been recorded from the West Camp in the Santa Eulalia District. The San Antonio Mine (San Antonio el Grande Mine), East Camp, Santa Eulalia District records 11 vanadinite specimens all with significantly different crystal form than this specimen. It appears that these unique hoppered crystals were coming out at least 30 years prior to the existence of Mindat. Larry Maltby”

“Pink cobaltoan calcite and green malachite Photo & Collection: Yannick Vessely”