The existence of this cave has been known for 100 years. its crystals resemble swords measuring up to two meters. it is the shallowest cave, meaning that it is the most accessible. its crystals are complex, since they contain biogenic shapes, fossilized by minerals of which they are numerous deposits. the crystals apparently also contain the remains of pollen and probably biological material useful for the study of DNA.


Sword-shaped crystals after which the cave is named.

Alicia Dávila inside the Sword Cave.

Miners discovered this spectacular cave 100 years ago. Crystals up to 2 meters in length stud the walls like swords. This cave, the closest to the surface, is -120 m from the mine’s entrance and about 87 m long.

A preliminary study showed that the crystals of the swords’ cave are of a complex composition; and some of them are rich in biogenic forms fossilized by minerals of new formation.
A recent speleological study resulted in the recuperation of pollen inside a crystal. This might be a factor in defining the micro climate in the area at the time of the cave’s formation. At the present time scientists are studying the fluid inclusions in the crystals, in order to possibly recover biological material useful for DNA study.


The analysis of remains found in a crystal is being investigated. This could be an important factor for determining the predominant climate conditions during the time when these crystals were formed.