Obsidian Rounds Size:2" This small specimen pair displays

This small specimen pair displays orange

Chapter 16: Almost Geodes: Concretions and Septarians

Tourmaline in Quartz tumbled stone features black tourmaline in translucent quartz

This specimen features a dark purple chalcedony in orb formations

created in collaboration with the Smithsonian Institution and written and edited by dozens of scientific professionals with decades of experience

Obsidian Rounds Size:2" This small specimen pair displaysThese Obsidian Rounds are a smooth saucer shape, slightly domed on both sides, made of black obsidian, and polished to a high shine. Two sizes available: 2" diameter, 1. 5oz 1. 5" diameter, 0. 5 oz