Hiding in plain sight in central Texas is a rare igneous rock containing stunning, yet mysterious, blue quartz. 🪨 It's called Llanite, and researchers have yet to settle exactly why it contains such vivid blue quartz. In this video, Rachel Phillips (Geo Girl) takes us with her on a Geological Society of America Field Trip to Llano, TX to explore this beautfiul rock up close and how it came to be. Want to join in on the exploration? GSA offers expert-guided field trips every year, around the wor