It’s time for #MineralMonday! Amethyst, citrine, agate, chalcedony, jasper, and dozens of othe

It’s time for #MineralMonday! Amethyst, citrine, agate, chalcedony, jasper, and dozens of other names are used for beautiful minerals of many different colors and textures. But did you know? They’re all varieties of quartz!

Quartz is the second-most common mineral on Earth and it makes up most of the sand on many beaches. What distinguishes the quartz varieties is the size of their crystals and the causes of the different colors.

Photo: E. Louis/© AMNH

#NewYorkRocks #gems #minerals #rocks #crystals #quartz #purple #NaturalHistory #amnh #DYK #museums (at American Museum of Natural History)
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