[Rockhounds] Why Pumice Floats and Why it Sinks

[Paul]

How X-rays helped to solve mystery of floating rocks in the
ocean. Experiments at Berkeley Lab show scientists how
pumice can  remain buoyant for years, UC Berkeley, Berkeley Lab
http://newscenter.lbl.gov/2017/05/23/how-x-rays-helped-to-solve-mystery-of-floating-rocks/
https://www.sciencedaily.com/releases/2017/05/170523144110.htm

Fauria, K.E., Manga, M. and Wei, Z., 2017. Trapped bubbles
keep pumice afloat and gas diffusion makes pumice sink.
Earth and Planetary Science Letters, 460, pp. 50-59.
http://seismo.berkeley.edu/~manga/fauriaetal2017.pdf

Yours,

Paul H.