Some caves are famous for giant gypsum crystals (up to 11 m in length!), among them "Cave of Swords" in the Gibraltar Mine, and "Cave of Crystals" in the Naica Mine.
Note that the upper level oxide workings of the Gibraltar, Maravillas, Lepanto etc. Mines were incorporated into the Naica Mine in the mid-1950s and although names like Gibraltar Shaft survive within the Naica Mine, these old names no longer bear any relation to the current workings (now dominantly well below the 500 m Level). Pretty much any specimen mined since the 1950s...except for crystals taken from the Cave of the Swords (and most of the gypsum crystals that have come out in that period came from caverns other than the Cave of the Swords) should be simply labeled Naica Mine, Naica...etc.
Distinctive sharp gypsum crystals on a dark brown hard limestone matrix come from the Chubasco Breccia Body...probably a collapsed solution cave/pipe. Chubasco lies at the end of a long exploration heading driven to chase a geophysical anomaly. There was no ore present and the drift was closed off permanently.
Mineral ListMineral list contains entries from the region specified including sub-localities
61 entries listed. 39 valid minerals.
Localities in this Region
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
- Fisher, R.D. (2006): Die grössten Gipskristalle der Welt: "Crystal Cave of the Giants" in Naica, Mexiko. LAPIS 31 (11), 33-36. (in German)
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Locality Updated: Woodsboro, Frederick Co., Maryland, USAFrom Bill Cordua, 13th Dec 2013 02:30:58