Opal (var: Opal-AN) / (var: Hyalite Opal) (“Blood Vessel Opal”) Mogok The Black Cloud was one

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

This crystal group exhibits the classic "sword-shaped" habit with high luster

A nice representative piece from this famous discovery

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

Opal (var: Opal-AN) / (var: Hyalite Opal) (“Blood Vessel Opal”) Mogok The Black Cloud was oneA 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