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Is amethyst metamorphic, sedimentary, or igneous rock?

I’m doing this project for school and I have to identify some rocks. One rock I’m having trouble with is the amethyst. I need an answer fast if possible because the project is due thursday feb. 5. Thank You

4 COMMENTS

  1. amethyst is a gemstone, a type of quartz, and thus isn’t really a rock, it is a mineral.
    A common way that amethyst forms is from very hot waters, geothermal (hydrothermal) water. This puts amethyst into a kind of gray area that is neither magmatic nor metamorphic, but also sort of each.
    I guess if I had to put it into one or the other box, I would put it into magmatic, although it doesn’t really form from cooling lava, but rather more from the hot waters that come out when the lava cools.

  2. The first post was correct, amethyst is a mineral. Because of this, you can find it in all three types of rocks depending on their origin. However, you would most likely find large amethyst crystals forming inside of a geode, making it classified as a sedimentary rock. Basically if the quartz was dissolved in a solution trapped inside a rock cavity, then as the water evaporated from the small pores in the rock, the minerals would precipitate out from the solution and form crystals.
    You can also find it in crystal form within an igneous rock. When the molten material cools slowly enough, you will find amethyst crystals inside those igneous rocks.
    Any amethyst found in a metamorphic rock would likely no longer retain its crystal structure after the extreme pressure and heat. It’s unlikely, although not impossible, that you could extract usable amethyst from metamorphic rocks for this reason.

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