Seven Springs Onyx slab

Double polished Seven Springs Onyx slab from Mayer, Arizona 

This slab is Dendritic with Quartz and Vaporized Calcite. 

Lots of pretty formations in this specimen. 

Measures 12 7/8 inches long, 5 7/8 inches wide, 1 1/4 inch tall.

Weighs 4 pounds 15 1/4 ounces