Aura Quartz - D Lime Calcite 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

Septarian nodule from Utah carved and polished into a freeform shape that stands upright

These pieces are polished into a tower shape

These pieces are polished into a small worry stone shape

Aura Quartz - D Lime Calcite The iridescence is caused byRainbow Aura Quartz is a variety of natural quartz that has been altered by metal vapors bonding to it. These metals include gold, titanium, platinum, and silver, and they alter the color differently. You will receive the exact item pictured. Average Dimensions: 1. 75 L X 1. 5 W X 2. 5 H inches Average weight: 0. 15 lbs