Minerals
Smoky Quartz
Furka, Urseren, Uri, Switzerland. 10.4 x 6.4 cm. USK Minerals specimen
Quartz var. Amethyst
Las Vigas, Veracruz, Mexico. 4.5 cm. USK Minerals specimen
Quartz var. Closed Gwindel
Galenstock, Furka, uri, Switzerland. 2 cm. USK Minerals specimen
Diaspore (color-change)
Mugla, Turkey. Thumbnail. USK Minerals specimen
Diaspore (color-change)
Mugla, Turkey. Thumbnail. USK Minerals specimen
Fluorite
Galenstock, Furka, Uri, Switzerland. 3.3 cm. Private coll. Ex. USK Minerals specimen
