by sysadmin | Jun 24, 2016 | Blog
Chalcopyrite on Dolomite- Sweetwater Mine, Reynolds County, Missouri. 12 cm x 7 cm Chalcopyrite is a copper iron sulfide mineral that crystallizes in the tetragonal system. It has the chemical formula CuFeS2. A major ore of copper, common in sulfide veins and...
by sysadmin | Feb 11, 2016 | Blog
Native Gold with Azurite, Malachite, and Chrysocolla- Blue Bell Mine, Mystery Hill Mine group, Swansea, Santa Maria District, Buckskin Mts, La Paz Co., Arizona. 5.5 cm across This specimen consists of a mass of dense, heavily silicified chrysocolla that hosts a...
by sysadmin | Jan 10, 2016 | Blog
Azurite and Duftite on Quartz- Tsumeb mine, Otavi Highlands, Tsumeb, Namibia. 7.5 cm tall. Ex. Karl Sprich specimen. A rare combination from Tsumeb
