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Were you born in October? Then that means one of your birthstones is tourmaline! Some of the first gemstones mined in the United States, tourmalines come in a variety of colors. Their hue is determined by the metals present in each gemstone’s crystal structure. Photo: © AMNH

14/10/26, 8:56 pm7 reposts41 likes

American Museum of Natural History

@amnh.org

For example, pink tourmalines contain more manganese, while green tourmalines have higher levels of iron, chromium, and vanadium. See these gems and more in the Mignone Halls of Gems and Minerals! Plan your visit: amnh.link/4bnMbG3

amnh.linkPlan Your Visit | American Museum of Natural HistoryStart here: find out how to get to the Museum, get tickets, and map out your must-see exhibits.