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Pink Chalcedony
A pink chalcedony shows off its beauty. Chalcedonies include many types of cryptocrystalline quartz gems and feature a number of different colors. Geologists can tell a chalcedony from the arrangement and structure of its crystals.

Photograph by blickwinkel/Alamy

Minerals

See pictures of minerals (azurite, gypsum, and others) from National Geographic.

Minerals

This is the oldest blue pigment ever discovered in Europe

This is the best evidence yet for ancient life on Mars

This asteroid is spilling secrets about the origin of life on Earth

Where might we find life in our solar system?

One of the hardest colors to make is not just blue—it's actually cerulean