Flowstone

When water enters the cave it must flow somewhere. If the water simply flows away, over rock or mud, it will leave a trace of calcite crystal behind. More water deposits more crystal until a hard sheet of crystal has been created. This is what flowstone is. A simple way of thinking of it is stone that has flowed down over a surface. Remember that the stone doesn't really flow - it is just crystal deposits from the water.

If a deposit of flowstone is sparkling it is most likely dry. Light is able to reflect off the crystal facets quite easily. If the flowstone has a waxy appearance then it is probably coated in a film of water and hence new formation is being deposited.