Due to the white solid deposits around the pool, its called the opal pool.

  Us at Wai-o-Tapu.

  Nice view from one of the lookouts.

  These mud pools were called the percolators because they were so noisy.

  Thermal pool.

  Crystallized sulfur as you would see inside a cave, but we are not in a cave. :)

  Here is a close up of the sulfur crystals.

  Scenic area.