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When it comes to mineral species
The piece is notably gemmy / transparent and really looks good with a bit of backlighting to see in the insect inclusions
Specimen # BOL711B238
Most everything that evades the crusher is usually taken out of Bolivia by a geologist who has an "in" at the mine
"sword"-shaped crystals of Vivianite with white bladed Barite and minor metamorphosed Sandstone
Chalcedony on Smoky Quartz “casts” after Laumontite Urals When it comes to mineralThis 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
