Baby Tufas, New Zealand
These formations reminded me of tiny Tufas in the making, but alas they are Travertine. Travertine is a terrestrial sedimentary rock, formed by the precipitation of carbonate materials from solution in ground and surface waters, and/or geothermally heated hot-springs like this one. Similar (but softer and extremely porous) deposits formed from ambient-temperature water are known as Tufa which can be spotted in Mono Lake, CA.
These are native to The Champagne Pool, in Rotorua, New Zealand.