👉 Obsidianite is a mineral that occurs naturally in rocks and minerals. It has a dark, black color with distinct crystals that are often arranged in a triangular pattern. The name "obsidian" comes from the Greek word "obesus" which means "stone". Obsidianite is a type of quartz crystal that is highly resistant to erosion and heat, making it useful as a building material and for use in various industries such as jewelry, construction, and ceramics.