Flowstone

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", or limestone caves, where they are the most common cave formation. However, they may form in any type of cave where water enters that has picked up dissolved minerals.

The subterranean Coway tribes, on the planet Mimban, made spears and other implements from flowstone.

Appearances

 * Splinter of the Mind's Eye