Vale Loureiras quarry
Alcobertas, Rio Maior, Santarém, Portugal
Vale Loureiras (Pedreira nº 3634), Alcobertas, Rio Maior, Distrito de Santarém, Portugal
Key Information
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Vale Loureiras quarry is in Alcobertas, Rio Maior, Santarém, central Portugal, part of the Estremadura Limestone Massif.
It produces calcite and dolomite, with calcite known for unique crystal forms like trigonal plates and prisms.
The geological structure is Jurassic limestone, featuring karst topography with caves and sinkholes.
The quarry was active in 2020, with limited historical details available; limestone quarrying is significant locally.
Alcobertas has cultural highlights like a dolmen and the Church of Santa Maria Madalena, with traditional Portuguese cuisine nearby.
The climate is Mediterranean, with hot summers and mild winters, supporting diverse limestone-adapted ecosystems.
Geographic Location
The Vale Loureiras quarry sits in Alcobertas, a civil parish within Rio Maior, Santarém district, in central Portugal. This region is part of the Ribatejo province, known for its agricultural and industrial activities, and is nestled within the Estremadura Limestone Massif, a notable geological formation. Alcobertas is famous for its dolmen, a megalithic structure, and natural caves with stalactites and calcite crystals, adding to its appeal for mineral enthusiasts.
Minerals Produced
The quarry is primarily known for limestone, which is calcium carbonate (CaCO₃), and also produces dolomite, calcium magnesium carbonate (CaMg(CO₃)₂). Calcite here is particularly interesting, with crystal forms including trigonal crystallizations, large crystals, trigonal plate crystals, short hexagonal prisms, and rare small scalenohedrons, making it a draw for collectors seeking unique specimens.
Geological Structure and Mining History
The geological structure consists of Jurassic limestone, part of the Estremadura Limestone Massif, known for its karst features like caves and sinkholes, formed by limestone dissolution. The quarry was active as of 2020, but specific historical details are scarce; however, limestone quarrying has been a significant activity in Alcobertas, reflecting its economic importance.
Local Culture and Climate
Alcobertas boasts cultural landmarks like the dolmen and the Church of Santa Maria Madalena, with local industries including poultry, pork, and stone-related crafts. The Mediterranean climate, with hot summers and mild winters, supports a diverse ecology adapted to the limestone environment, enhancing the region's natural beauty.