One of the big surprises in this collection was the best specimen of this old late-1970s material that I have yet seen in mineral collecting: a mimetite from the Bilbao Mine - NOT form the much more common Ojuela or San Pedro Correlitos locales. If you look closely at the form, the luster, you can spot the difference. The waxy, silky surface to these stands out, at their best. Also, the matrix underneath is not the typical gossan you would see at hte other two Mexican mimetite locales. This is a beautiful, 3-dimensional, aesthetic specimen in its own right - but it ALSO has strong significance for its unique locality and for the top quality it represents, from the locale. Comes with custom lucite base for display.