Chalcanthite (rare locality specimen)

Item Description

This is the only specimen of Chalcanthite that we've ever had to offer from the Sedalia Mine. We can't even find another example for comparison, which makes it a highly desirable rarity for the locality, especially if you have a comprehensive Colorado collection. Typically, Chalcanthite forms naturally as a post-mining product in copper-rich solutions from the mine, and that's likely the case with this specimen. Beautiful intense blue colored, gemmy groups of semi-parallel fibrous Chalcanthite can be seen on all sides of the oxidized matrix (the label states it is Limonite for reference). A really cool specimen from what mindat.org refers to as the, "largest copper mine in Colorado".
Ex George Loud Collection No. 29.6.5.1 CO.2; 2290. George (born August 16, 1942) is a well-known mineral collector from Washington, DC and South Carolina respectively, and was a patent lawyer by trade for over 50 years. He assembled one of the great mineral collections in the U.S., comprising worldwide specimens, and in later years he sold the worldwide specimens to focus on minerals of the United States, specifically locality suites with an emphasis on amazing representation of species while still maintaining fine quality. The specimens remarkably range from micros to all the way up to large cabinets in size. We recently acquired most of his impressive 9000+ piece collection, and the VAST majority of these pieces will be offered here in the auctions, as we feel that everyone deserves and equal opportunity at acquiring these important, well-documented and fine quality specimens for their collections.
See: https://mineralogicalrecord.com/biographies_labels/george-loud for more information