Wiktionary
n. (context geology English) A layered deposit of calcite formed by water flowing down the walls and along the floor of a cave.
Wikipedia
Flowstones are composed of sheetlike deposits of calcite formed where water flows down the walls or along the floors of a cave. They are typically found in "solution caves", in limestone, where they are the most common speleothem. However, they may form in any type of cave where water enters that has picked up dissolved minerals. Flowstones are formed via the degassing of vadose percolation waters.
Usage examples of "flowstone".
Spock and his work crew far less time to crack off the thick rind of flowstone that had built up around the alien transporter unit through uncounted millennia of being dripped on by runoff from the natural caves overhead.
Now they were in a cave filled with chromatically colored formations: stalagtites, helicites, flowstone, and much more.
The flexible chambers widened and narrowed and widened again in serpentine rhythm, carpeted with slippery flowstones and walled with mineral tapestries.
When we lowered the light it touched on more wonders: gargantuan columns, dozens of tunnel openings, flowstone curtains that glittered translucently, a shaggy forest of helictites beneath a high-up opening that obviously vented air into this area.