Cave coral even covered the stalagtites. Cave coral is just calcium/limestone deposits. Like Scott said, think limestone deposits in your bathtub.
Now this looked more like a huge geode, but was just more cave coral.
These were the longest, skinniest soda straws I've ever seen.
I can't remember what he called this, but it is the only kind of formation in caves which can form under water.
I saw this and immediately thought, spiny urchin!
Aliens or a huge jellyfish?
A perspective on the size of some of the formations.
I thought this was one of the prettier formations.