“The one known fingerprint of a sulfurous volcano is a compound called anhydrite, which dissolves in groundwater. Just a few years after an eruption... all traces of anhydrite are gone. This explains why the substance had pretty much eluded scientists before it was discovered at El Chichón.”

—  Shawna Vogel

Naked Earth: the New Geophysics (1995)

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Shawna Vogel 13
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