Trivia: Mexico’s “Sistine Chapel of Crystals” is a cave filled with what mineral?
Gypsum
Quartz
Diamond
Amethyst
The correct answer is Gypsum
So why is this answer correct? : Spires of a glasslike mineral called gypsum penetrate this cave, which reaches 1,000 feet beneath Naica mountain in Mexico’s Chihuahua province. The otherworldly cave was discovered in 2000 as a result of mining activity, and it contains some of the largest natural crystals ever found — some measure up to 36 feet long.