This block is an example of the one you will receive

There may be chips and nicks off the sides as they are not packaged well from China.

The photos are taken outside. The fourth photo I wanted to show opalescence with it backlit by the sun.

These blocks measure approx  4 1/4" x 4 1/4" x 1 1/8"

It weighs approx 2 pounds

This glass was made to resemble real opal.  

It has a luminous moon-like glow to it.

This material is easily knappable and behaves like glass. 

It contains a high amount of phosphorus to make it look like Milk Opal.

THE LAST PHOTOS SHOWS EXAMPLES OF HOW THIS MATERIAL KNAPS AND IS NOT INCLUDED IN SALE

We have been selling rough rock and slabs in Quartzsite, Arizona for over 20 years.  

Thanks for looking