Mystery AtlasBlack Stone Agate Hypothesis
Geologists Robert Dietz and John McHone's 1974 proposal that the Black Stone is not a meteorite at all but a terrestrial agate, based on a secondhand report describing diffusion banding characteristic of agates rather than any meteoritic texture.
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Theories & Explanations
Black Stone Agate Hypothesis contradicts Wabar Impact-Glass Hypothesis.
Black Stone Agate Hypothesis contradicts Burton's Meteorite Claim.
Objects & Artifacts
Black Stone Agate Hypothesis attempts to explain Black Stone of the Kaaba — Untested against the stone itself: Dietz and McHone based their conclusion on a secondhand geologist's report of banding, not direct sampling.