It looks slightly duller, less glassy. Click to enlarge. This close-up from the back-side of the above sample shows some elongated features common in some pumice.
This pumice is the most weathered of the three. It looks almost chalky.
The orange marks are from a marker pen. This close-up of the above sample shows that the sample is still full of holes and pore space. If you rub any pumice sample, small abrasive bits of rock glassy debris come off in your hands.
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While pumice ranges in color from white to black, scoria is darker in color, ranging from dark brown, to black to red. The Easter Island statues were carved out of volcanic rock, and the red stones on top were carved out of a different type of scoria rock prized for its red color.
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Scoria - Igneous Rocks
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