Who would have thought a fluorescent rock that floats?!? Here's aragonite and calcite on pumice from Taupo, New Zealand. The area around Taupo is volcanic, with lots of hot springs and thermal activity, creating the calcium rich deposits on the pumice. Though the card that came with the specimen states calcite, I'm guessing the white material is aragonite and the orange is the calcite. Surprising that the pumice has a definite glow to it as well. Neat piece with a great phosphorescence. About 3 inches by 2 inches. Shown in LW, SW, LW phosphorescence, and natural.