This test is a follow on to a short discussion in the comment section of a recent post, resulting in two questions we can ask about the six rocks I've set on an outdoor table in the backyard: Which of these rocks will float? And can we call any of these rocks pumice?
|Rock #1: A scouring block of vesicular rhyolite (flow rock) from Glass Mountain. Rock collected by MOH.|
|Rock #2: A second scouring block from the same locality as Rock #1. Rock collected by myself.|
|Rock #3: I wouldn't hesitate to call this pumice. It's from the pumice pit at Glass Mountain (Google Maps location). Rock collected by MOH.|
|Rock #4: Banded rhyolite obsidian from Glass Mountain.|
Rock collected by MOH.
|Rock #5: Vesicular rhyolitic flow rock from Glass Mountain, with flow lineations on the upper surface. Rock collected by MOH.|
|Rock #6: Crenulated slaty phyllite from eastern Nevada.|
Rock collected by myself.
|Okay! Here we go! Any guesses?|