Dreislar, North Rhine - Westphalia, Germany - A good Dreislar example with tightly packed ivory white blades of barite with a pink baryte backing, dotted over by isolated dark golden iridescent chalcopyrite and some off white dolomite rhombs. Size: 4.3 × 7.1 × 4.8 cm

Sweetwater  Mine, Missouri, USA - Colorless to very pale yellowish translucent semi-lustrous prismatic crystals of calcite to 3.7 cm in length set attractively over the top of a 9.5 x 5.5 x 5.0 cm pyrite, chalcopyrite, and dolomite crystal matrix. Very minimal micro-cleaving present, this is in very good condition and sits very nicely by itself for display.

Brushy Creek Mine, Viburnum Trend, Reynolds Co., Missouri, USA - Various yellowish translucent double terminated calcite crystal to 1. cm in length show upon a breccia matrix with crude iridescent purplish blue crystals of chalcopyrite to 0.3-0.4 cm. In very good condition as seen. Size: 13 x 7.5 x 2.0 cm.

Sweetwater Mine, Reynolds  Co., Missouri, USA - Beautiful iridescent brassy to purplish large crystals of chalcopyrite to 1.0 cm in size scattered over the top of a 4.5 x 4.5 x 2.0 cm dolomite crystal coated matrix. Shows nicely all around and in excellent condition. Very good large crystals for the species from this locality. 

Fletcher mine, Viburnum Trend, Reynolds Co., Missouri, USA - A classic calcite specimen from this locality. The calcite is biterminated and 2.8 cm in size and sits on a matrix formed by a rich coating of chalcopyrites and dolomite with siegenite ! Nice combination specimen of 3.5x3.5x3 cm

Sweetwater Mine, Viburnum Trend District, Reynolds Co., Missouri, USA - Showy purple to blue iridescent crystals of chalcopyrite to 0.3 cm in size scattered over this shapely 7.5 x 6.0 x 3.5 cm white dolomite crystal coated breccia matrix. Micro-chipping present but sparse, I think this in good condition.

Sweetwater Mine, Viburnum Trend District, Reynolds Co., Missouri, USA - Very nice cluster of terminated calcite crystals on a coat of tiny dolomites and chalcopyrites. The calcite are all terminated and 2.5-3.5 cm in size. Overall size is 8x2.5x1.8 cm

Sweetwater Mine, Viburnum Trend District, Reynolds Co., Missouri, USA - Well shaped bi-terminated calcite crystal of 3.7 cm stands on this matrix coated by dolomite and chalcopyrite crystals. Nice rock of 8x3.7x1.8 cm

Temperino mine, Campiglia Marittima, Grosseto, Italy - Nice specimen with a great coverage of  quartz crystals. Dispersed among the quartzes there are variious ilvaite crystals up to the size of 1 cm. There is also a super golden crystal of chalcopyrite of 1 cm in size ! Overall size is 11x6x5 cm

Kambove, Katanga, Congo (Democratic Republic) - A bright cluster of chalcopyrite crystals is nicely set on calcite crystals. The cluster is 1x1.2 cm in size and show the classic reddissh color. All around there are various chalcopyrite and carrollite crystals. Overall size is 5x4x4 cm. Ex Colin & Ivora Collection