People often ask how to tell the difference between black obsidian and black onyx. That is a very good question and one that doesn’t come with a definitive answer.
Both obsidian and onyx are black stones (can be other colors as well) which contain silicon and other impurities. The main difference between obsidian and onyx is how they are formed.
Obsidian is formed when molten lava erupts from a volcano and cools quickly upon reaching land or water. As a result, obsidian does not have a crystalline structure. This volcanic glass is usually glossy and glassy and generally weighs less than onyx. It can also have a translucence to it.
Onyx, on the other hand, has a crystalline structure because it grew in the ground for a very long time. Onyx tends to have a duller finish. Another difference is that onyx can also have white, gray or black bands.
Black obsidian doesn’t have bands. Obsidian is one gem that comes in an assortment of colors and styles due to its mineral content and tiny gas bubbles that got caught inside during its quick formation. Rainbow obsidian is a example of obsidian which has an intriguing rainbow design.
After all that, you may still need a strong magnifying glass nearby.