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The volcanic ash added a mineral called phillipsite to the concrete, and a study published Monday in the American Mineralogist reveals that aluminous tobermorite crystals grow in the Roman concrete when it is exposed to water.—Jay Bennett, Popular Mechanics, 5 July 2017 The tests showed a rare chemical reaction, with aluminous tobermorite crystals growing out of another mineral called phillipsite.—The Washington Post, NOLA.com, 6 July 2017 The tests revealed a rare chemical reaction, with aluminous tobermorite crystals growing out of another mineral called phillipsite.—Ben Guarino, Washington Post, 4 July 2017
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