Estopiñán del Castillo is famous for its Aerinite. Aerinite is a bluish-purple inosilicate mineral. Its name comes from a Greek root "aerinos," meaning "atmosphere" or "sky blue". It was first described by Lasaulx (1876) from a specimen in the Wroclaw museum that was obtained in Aragon, Spain. In 1882, the geologist Luis Mariano Vidal found the mineral in situ in Caserras del Castillo, a locality that currently belongs to the municipality of Estopiñán del Castillo.
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