The Cave of Crystals in Mexico has the world’s largest selenite (gypsum) crystals about 1,000 feet below the surface in a hot cavern. Some of the crystals are over 50 tons in weight and 35 feet in length!
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4 Responses to “Giant Crystals”

  1. Leah Thompson says:

    cool! thank you!

  2. Gypsum is really soft – it’s only a 2 on the Moh’s hardness scale. You can read more about the Cave of Crystals here.

  3. Leah Thompson says:

    how long would it take for one of those crystals to grow?
    how hard is gypsum?

  4. Beth Symes says:

    cool. they are giant. achy 11