A riveting, intense yellow-orange Mimetite thumbnail from this important and one-time-only 1969 find at the Congreso-Leon Mine in Mexico. This Mexican Mimetite discovery was unique and now legendary and this piece is one of the great thumbnails from that find! It has large, yellow, glistening balls of Mimetite mounded up to a 2cm ball on the top. The piece is complete all around and has excellent color. A ONCE IN A LIFETIME FIND, never repeated, since 1969. These remain classics for the species, and this is not just a "small specimen," but rather is a fine thumbnail.