I want to see some numbers. It's just porous mafic rock (i.e. pumice) in the presence of hot seawater. ed. wait, no, it's felsic? but it forms quickly in marin

I want to see some numbers. It's just porous mafic rock (i.e. pumice) in the presence of hot seawater. ed. wait, no, it's felsic? but it forms quickly in marine environment... either way, there's a lot of it