howtogeek at June 19th, 2013 13:39 — #1
harv at June 20th, 2013 08:12 — #2
The only rock? What about meerschaum?
ladyfitzgerald at June 20th, 2013 08:43 — #3
Not all meerschaum floats. The meerschaum that does float isn't as buoyant as most pumice.
harv at June 20th, 2013 09:07 — #4
I know not all meerschaum floats, the point is that pumice is not the only rock that floats.
mhenriday at June 20th, 2013 11:05 — #5
Not a particularly good idea to attach one's message to pumice if the intended recipient is any distance away - it quickly becomes waterlogged and then sinks....