Obsidian is a natural vitreous rock formed after rapid cooling of volcanic lava. The main component is silicon dioxide. Because of its powerful functions, it also has the reputation of being a black diamond warrior. Obsidian is usually black, but also gold, สีน้ำตาล, สีฟ้า, ฯลฯ. นี้ “สีดำ” is not pitch black, but a rainbow of […]
