A thin crust supports a carpet of golden yellow, translucent spheres of mimetite, to 1 cm across. The color is just about as good as it gets from this mine. One of the big surprises in this collection was findign two specimens of this old late-1970s material, the best for sale 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. This would cost the same as a San Pedro piece, but it is actually MUCH more desirable to my mind. Comes with custom lucite base for display.