Obsidian is a unique natural glass formed from the rapid cooling of hot lava. Its rich colors, ranging from black to brown-green, dark red, and even snow-like hues, are a result of its varied mineral composition. Believed to be an ideal stone for those who are spiritually sensitive, obsidian is known for its protective properties. It helps shield against negative energy, whether it stems from within, such as negative thoughts, or from external sources.