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Dec 29, 2020 at 0:33 comment added JBH If rock isn't a requirement, I remember in my younger days sitting off a beautiful lake in Finland and watching the wind casually push a half-mile-square island across it. All the OP needs are trees with strong, inter-tangling roots and the build up of enough biomass to make the island a couple of meters thick (and buoyant). Suspension-of-disbelief would allow it to survive a hurricane, but maybe not a tsunami. But, I'm not sure the pumice would survive a tsunami. That might actually be a limiting factor to the believablity of the idea.
Dec 28, 2020 at 21:06 comment added Gimelist Pumice rafts are essentially glorified floating dust. They also disperse rapidly, in days to weeks. I’m not sure that an “ephemeral stain that you can’t even stand on” satisfy OPs definitively of “island”.
Dec 28, 2020 at 19:01 history answered PcMan CC BY-SA 4.0