Carrollite

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Carrollite is a steely gray mineral found in Carroll County, Maryland. It got its name from the copper ore mines near Sykesville and Finksburg, Maryland where it was first found. It consists of a mixture of linnaeite and intergrown copper sulfides. The cobalt in the linnaeite is partly substituted by copper, iron and nickel.

[edit] Source

• [1]
• Dana's Textbook of Mineralogy 4th edition 1922.