Thunderegg with 'Crazed' Opal - Richardson Ranch

From the Richardson Ranch, Blue Bed

A thunderegg of dark agate and 'crazed' common opal around a mineral growth in the center, which gives it a look that merits the name of an egg. Opel is highly prone to natural fracturing, created during its formation, and it is the tense network of cracks that make this egg.

Size: 2 3/8"w x 2 5/8"h x 1 1/8"d. Weight: 5 ounces