amnhnyc: It’s time for #MineralMonday! Pictured is a specimen of grape agate—can you see
amnhnyc: It’s time for #MineralMonday! Pictured is a specimen of grape agate—can you see where its nickname comes from? Grape agate is a form of quartz (variety: chalcedony). Small spheres of purple quartz are what gives this rock its signature look. See it up close and learn more about the diversity of the mineral world in the Mignone Halls of Gems and Minerals! Photo: E. Louis/ © AMNH #NewYorkRocks (at American Museum of Natural History)https://www.instagram.com/p/CUVceWErqZT/?utm_medium=tumblr -- source link
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