Chalcedony on Smoky Quartz “casts” after Laumontite Pyromorphite tree-like formation

tree-like formation

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

A group of very well-formed

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

Specimen # BULG4121

Chalcedony on Smoky Quartz “casts” after Laumontite Pyromorphite tree-like formationThis 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