Zone in which blackish slates and interleavings sandstones, appear as strata strongly folded and trumped in which, occasionally, nodules of pyrite appear.
There a mine exploited veins of iron´s oxides, principally hematites, already in prerromanic epoch, and in the last times by the Sociedad Metalúrgica Duro Felguera, until 1967.
Ref.: Calvo, M & Viñals, J & González López, J R (2007). Presencia de tamarugita en los acantilados de Llumeres (Asturias). Revista de Minerales (Mineral Up), 2007-2, 49-52.
6 entries listed. 6 valid minerals.
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