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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 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 revealed a rare chemical reaction, with aluminous tobermorite crystals growing out of another mineral called phillipsite.—
Ben Guarino,
Washington Post,
4 July 2017