Black Obsidian vs. Black Tourmaline – The Similarities and Differences (With Photos)
Even though obsidian and tourmaline are on opposite ends of the geological spectrum, they each have their unique qualities and interesting appeal. These two minerals show how many different things can be found in the Earth’s crust. Obsidian comes from volcanoes. It has a smooth, glass-like look, and its colors are mostly dark and moody. … Read more
