Explore the dazzling science behind one of Earth’s most mesmerizing treasures with this TED-Ed companion resource! Based on the story of the Halley’s Comet opal, this lesson delves into the formation of precious opals, the role of silica and water, and the optics of light interference. This resource includes 20 engaging discussion questions, a structured essay prompt, and a thought-provoking debate topic. Perfect for high school or college-level earth science, chemistry, physics, or envir