Opal (var: Opal-AN) / (var: Hyalite Opal) (“Blood Vessel Opal”) Mogok and the only point of

and the only point of contact is on the back/bottom where it detached from the pocket wall

The Black Cloud was one of the most famous specimen producing locales in Leadville and was one of the last operating mines in Colorado when it closed in 1999

The Julia Fisk Mine is one of the more notable specimen producing mines in the Leadville District

A nice representative piece from this famous discovery

this specimen is a fine pseudomorph / cast consisting of hollow and thin cavities of Quartz replacing the original mineral

Opal (var: Opal-AN) / (var: Hyalite Opal) (“Blood Vessel Opal”) Mogok and the only point ofA rarely seen matrix specimen of Hyalite from San Luis Potosi, Mexico featuring bead like gemmy, colorless spheres which are included with a small amount of orange iron oxide to give it the blood vessel like inclusions, hence the nickname Blood Vessel Opal. Interestingly enough, the piece has a dual texture effect where some of the globules are perfectly smooth, while others have an alligator skin appearance on the surface. One can spend a great deal