Obsidian, being a form of glass, exhibits a more vitreous luster, whereas onyx, with its crystalline structure, tends toward a more silky, or even waxy, luster. Not only do onyx and obsidian differ in origin, but their physical and optical properties set them apart too. Physical and Optical Properties of Onyx and Obsidian Its formation process contributes to a more variegated appearance compared to the uniformity of black obsidian. Black onyx, while it may appear entirely black at first glance, typically features these bands upon closer inspection. Unlike obsidian, onyx forms through the deposition of silica in gas cavities in lava, which results in its distinctive bands or stripes. On the other hand, onyx is a banded variety of the mineral chalcedony, which is a form of quartz. The Formation of Onyx: A Variety of Chalcedony Black obsidian is particularly sought after for its reflective, deep black surface, presenting an almost mirror-like appearance that has fascinated cultures throughout history. This process results in a glassy, lustrous stone known for its smooth finish and sharp edges, making obsidian popular in ancient tools. It forms when hot lava expelled from a volcano cools rapidly with minimal crystal growth. Obsidian is often called volcanic glass due to its origin. What Are Onyx and Obsidian? Understanding Obsidian: The Volcanic Glass Join us as we embark on an enlightening journey to uncover the differences and celebrate the individual traits that set these black gemstones apart. Despite their superficial similarities, onyx and obsidian hold distinct characteristics and histories, making each unique in its own right. These stones, with their shadowy hues and lustrous finishes, house a world of mystery, beauty, and ancient power within their depths. When venturing into the realm of gemstones, particularly those with a mystifying deep black allure, one can’t help but be drawn to obsidian and onyx.

Macpilot vs onyx