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RM838   Tetrahedrite with sphalerite

Mundo Nuevo mine, Labor Jaqui, Huamachuco, Sánchez Carrión, La Libertad, Peru

A very rich group of tetrahedrite crystals with an intense metallic luster and deep black color, with well defined faces and edges. Faces show complex growth and some vertices are truncated by opposite tetrahedron faces. They are accompanied by groups of sphalerite crystals, complex forms, easily distinguished by its grayish dull sheen. Highlight the intense orange fluorescence of this sphalerite probably due to the presence of cadmium in its crystal lattice. From the Jaqui adit, a diferent locality not well represented in collections.

Size: 9,3 x 4,0 x 4,0 cm.
Main crystal: 28 x 26 mm.

Fluorescent under long wave UV