There are a few theories about how the opal then comes to be but we are going to go with the most widely accepted theory…
Groundwater that sits close to the surface evaporates as the season’s change which allows a very thin layer of opal to form in the pores and cracks within the rock. Opal develops inside these cracks near the surface over time, creating the seams and nodules that our present day miners dig today.
This is a gorgeous Purple opal specimen and would add greatly to any rock collection. Display not included.
Measurements are approximately: 5.75 inches wide,7 inches long, and .50 of an inch thick