the whole of the mining area, besides pyrite, we could find gypsum,
chlorite and some manganese ores. The pyrite usually presents
a cubic shape and more rare well formed cube-octahedral crystals.
Also pyritohedral forms. Some specimens with beveled edges also
have been found in Navajún. The length of the pyrite edges
varies among one millimeter to 20 cm, but you can find all the