Bottlebrush (cave formation) explained

A bottlebrush is a cave formation which results when a stalactite is immersed in rising water which is supersaturated with calcium carbonate. The stalactite becomes coated with pool spar.[1]

Notes and References

  1. http://www.goodearthgraphics.com/virtcave/bottlebr/bottlebr.html Bunnell, Dave, The Virtual Cave: Bottlebrushes