OrthoclaseThese floater crystals are found in a weathered porphyritic granodiorite dike in West Maroon Pass. This sharp, textbook monoclinic prism shows the typical hazelnut brown color that is most commonly associated with this material. A beautiful example of Feldspar from Colorado. Specimen# CO712B173

Depending upon the original shape of the Anhydrite

black minerals or minerals of Myanmar

Specimen# CO712B46

Specimen #MAD61609

and only a handful of worthwhile pieces survive in collections today

or a suite of Bolivian specimens

but there are a few minor imperfections here there that keep it from being a complete "floater"

Usually once a piece is more than a few mm thick

Specimen# AQUAID5103

which is extremely rare in my experience

the richer colored areas are a textbook example of the “Blood Vessel Opal” from this locality where the iron oxide inclusions have formed thin lines near the surface to give it an almost organic appearance

Specimen# CO712B188