Quartz-keratophyre is a hard subvolcanic rock. Cala Pregonda, Menorca, Balearic Islands, Spain.

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Photo credit: © José María Barres Manuel / Alamy / Afripics
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Keywords: balearic, cala, close, cuarzo-queratofiro, geology, hard, horizontal, hypabyssal, igneous, intrusive, islands, keratophyre, menorca, permian, petrology, pregonda, quartz-keratophyre, queratofiro, rock, spain, subvolcanic