(public domain photo taken by Shawn Thomas & provided by the American National Park Service)
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Lechuguilla Cave, located in Carlsbad Caverns National Park, southeastern New Mexico, is a world class cave with abundant gypsum speleothem. Seen here are exceptionally long soda straws, a type of stalactite - they appear to be composed of travertine (CaCO3, calcium carbonate). Soda straws are slender, cylindrical to subcylindrical dripstone speleothem attached to cave ceilings or upper walls. They have a hollow interior and form by dripping water.
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