Thumbnail Thursday - Aquamarine, Thuong Xuan District, Vietnam

Thumbnail Thursday - Native Copper in Calcite, Tsumeb, Namibia

Thumbnail Thursday - Wulfenite, La Morita Mine, Mexico

Thumbnail Thursday - Fluorite, Cave in Rock, Illinois

Thumbnail Thursday - Pyrite, Duff Quarry, Huntsville, Ohio

Thumbnail Thursday - Fluorite, Auglaize Quarry, Paulding County, Ohio

Thumbnail Thursday - Wulfenite, Apex Mine, Gila County, Arizona

Thumbnail Thursday - Powellite, South Hecla Mine, Houghton County, Michigan

Thumbnail Thursday - Black Topaz Star Cluster, SK Star Claim, Utah

Thumbnail Thursday - Wulfenite, Defiance Mine, Arizona