Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
These marbles were ground from a very porous lava containing numerous air bubbles that didn't escape before hardening and are pocked with craters wherever an air-bubble was breached while grinding into a sphere. Still it does not seem to effect their rolling! These are unique specimens in any marble, sphere or mineral collection.
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