A very FINE, SUPER RICH and SHOWY specimen of bright, micro-dendritic copper in a sawed, transparent gypsum cleavage from the Mission Mine of Arizona. Old and very choice material. Such thick windowpane slices with such rich forests of copper inside are almost never available! In person, looking at the internal meshwork, you can see how mesmerizing this is and why it is such a classic. Ex. Stoudt Collection.