Dioptase

Amazing group of interwoven copper crystals from The Centennial Mine #2, Houghton County, Michigan. Displays well from all sides.

Two penetrating cubes of Galena, with the largest crystal face being 3.3cm in length, perched on a small bed of matrix. The crystals have great luster. The specimen is from the Sweetwater Mine, Reynolds Co., Missouri.

Undamaged grouping of tan colored calcite crystals projecting prominently from a matrix which is covered with a first generation of smaller white calcite crystals. The top crystal is twinned. An unusual locality for me in that it comes from Gralex Quarry, Mont-sur-Marchienne, Charleroi, Hainaut Province, Belgium.

Attractive grouping of sky blue crystals. Good luster. Individual crystals up to 1.8 cm in length. This specimen is from Sylvania, Ohio.

Two intersecting crystals with good luster. Both crystals are terminated on each end. This specimen is from Mimosos do Sul mine, Mimosos do Sul, ES, Brazil.