Specular iron ore occurs in the form of brilliant metallic scales on many lavas, as at Vesuvius and Etna, in the Auvergne and the Eifel, and notably in the Island of Ascension, where the mineral forms beautiful tabular crystals.
MAYEN, a town of Germany, in the Prussian Rhine province, on the northern declivity of the Eifel range, 16 m.
His interest in mineralogy led him to study the geology of volcanic regions, and he made frequent visits to the Eifel with a view to the discovery of a theory of volcanic action.
The tract of the Hunsruck, Taunus and Eifel is an extended plateau, divided into separate sections by the river valleys.
The Eifel presents a sterile, thinly-peopled plateau, covered by extensive moors in several places.