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It depends on what you mean. Are there quartz crystals on earth that are growing today? Yes. Is that quartz crystal in your rock collection still growing? No. Quartz crystals often form when water with super concentrated silica in it comes into contact with a surface (such as a very small crystal) onto which the silica can precipitate. Crystals also form when magma/lava cools and the different elements in the mixture differentiate into various minerals.

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What mineral appears in transparent hexagonal crystals?

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