Amethyst crystals grow on the inside surface of agate geodes. While the crystals themselves may grow to be several inches, the geodes containing the amethyst crystals often reach several feet in height. This majestic gemstone ranges in colour from deep purple to pale lavender depending on the presence of manganese and iron. Amethyst can also appear reddish-purple or yellow-purple depending on the combination of minerals present in the clear quartz.
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