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RM1794   Dolomite with Manganese oxyde

Azkarate Quarry, Eugi, Esteribar, Nafarroa (Navarra), Spain

Very curious specimen of dolomite from this classic Navarrese locality, which shows a rich group of rhombohedral crystals, some with small negative rhombohedron faces and very sharp edges. They are partially coated with manganese oxides that give them a black and dull surface. This kind of specimens are very unusual in collections.

Size: 7.8 x 6.3 x 4.9 cm.
Main crystal: 18 x 17 mm.