What type of rock is formed by the rapid cooling of molten lava?
Dragonglass Obsidean Merikanite obsidian Obsydian Dragon glass Obsidian scalpel Obsidian rock Obsidian Obsidion Black obsidian
black obsidian obsidean obsidian scalpel merikanite obsidian obsidian rock obsidian dragonglass dragon glass obsidion obsydian
obsidian
WikipediaEntity
Obsidian