Linked from
The 14 pages that link to Pumice, each with the reason it gives.
PompeiiRelated: Falling pumice accumulated on Pompeii before later volcanic currents arrived.
ParchmentRelated: Parchment makers abrade dried skin with pumice to smooth and prepare its surface.
TephraRelated: Pumice commonly occurs as lightweight tephra in fall deposits.
TuffRelated: Pumice fragments can be incorporated into coarse, distinctive tuffs.