Obsidian Skull Brazil The iridescence is caused by

The iridescence is caused by the unique crystal structure in the layers of aragonite that make up the shell and how it reflects light

secondary copper mineral formed by weathering of copper ores

Dimensions: 3 L x 3 W x 3 H inches

Copper is an elemental mineral that crystallizes in the isometric crystal system

The mineral composition of the shell can include iron

Obsidian Skull Brazil The iridescence is caused byObsidian is a naturally occurring volcanic glass, an extrusive igneous rock, formed when volcanic lava rich in silica cools rapidly and forms without the formation of crystals. These pieces are polished into a skull shape. You will receive one piece selected from our current stock. All pieces are of similar size and quality. Average Dimensions: 2. 0 L x 1. 25 W x 1. 5 H inches Average Weight: 3. 8 ounces