It’s hard to appreciate how long it took an amethyst stalactite to form so that it could be removed and sliced for our appreciation. The slices that come from these stalactites are quite unusual.
Stalactites form over time as mineral rich water drips from the roof of a cave. Slowly but surely these minerals precipitate out and build the diameter of the stalactite. Over time the minerals being brought by the ground water may change, showing up as color changes in the concentric rings that form around the outside of the stalactite. Most of these start out with an agate center that then builds amethyst crystals around the exterior diameter. Amethyst is purple quartz and you normally see a combination of both the clear and purple crystals.
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