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Bottle Brush Crystal

1) its INTERNAL arrangement of atoms and molecules
2) the EXTERNAL forces restricting or redirecting the crystal's growth.

Inside the caves here there are no external limitations on the crystals that form because they are forming inside open space. (Many crystals on this earth form while cooling inside lava, so they are restrained by the surrounding rock.) Water dripping from the ceiling of the cave over thousands, maybe hundreds of thousands, of years slowly deposited microscopic amounts of the minerals dissolved in the water. Each time a drop of water passed over the same spot it would leave a little mineral behind, allowing the crystal to grow unchecked by external forces.

The crystal that you see here took thousands of years to grow. If you look closely at the bottom you'll notice a drop of water suspended on the tip of the crystal. The crystal is still growing, right before your eyes!

Come on, we've got a lot more climbing and hiking to do before we get to the next cool formation...the Chandelier Ballroom