Chalcedony on Smoky Quartz “casts” after Laumontite Pyromorphite and if you’re a collector

and if you’re a collector of Cassiterites or Bolivian minerals

A group of very well-formed

and I don’t know specifically when they were found

The fact that there are mines on this mountain is incredible considering the elevation and treacherous conditions

Good Quartz specimens from this locality are among my favorite from Colorado

Chalcedony on Smoky Quartz “casts” after Laumontite Pyromorphite and if you’re a collectorThis locality in the Cripple Creek District (purportedly in an old mine shaft) produced unique epimorphs or "casts" of Smoky Quartz and Chalcedony replacing Laumontite. The Smoky Quartz has a distinctive muted silvery grey color, with very little luster and a somewhat stalactite esque growth due to the way the Quartz overgrew the preexisting Laumontite. The lack of luster on the Quartz is most likely due to a micro coating of Chalcedony. The biggest