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Cave of the Crystals or Giant Crystal Cave (Spanish: Cueva de los cristales) is a cave connected to the Naica Mine at a depth of 300 metres (980 ft), in Naica, Chihuahua, Mexico. It takes the form of a chamber within the limestone host rock of the mine, and is about 109 metres (358 ft) long with a volume of 5,000 to 6,000 cubic metres (180,000 ...
Location of the Swords and Crystal caves with the gypsum crystals within the conceptual block diagram of Naica mine. The Cave of the Crystals is a cave approximately 300 m (1,000 ft) below the surface in the limestone host rock of the mine, about 109-metre (358 ft) long, with a volume of 5,000 to 6,000 cubic metres (180,000 to 210,000 cu ft). [7]
Selenite, satin spar, desert rose, and gypsum flower are crystal habit varieties of the mineral gypsum.. All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO 4 ·2H 2 O. Selenite contains no selenium, the similar names both derive from Greek selḗnē (σελήνη 'Moon').
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Decision question (Friedman, 2002): Does a given instance of Corral Puzzle have a solution? [1] This decision question is NP-complete. This is proven by reducing the decision problem of deciding the 3-colorability of a planar graph, which is known to be NP-complete, to a Corral Puzzle.
The cave is located in the Tapir Mountain Nature Reserve. The main cave system is about 3 mi (4.8 km) long and consists of a long river passage for approximately 2 mi (3.2 km), which ends at an upstream sump. A series of upper prehistoric passages continues another mile past the sump through massive breakdown boulders and giant rooms.
The "Lukina jama" cave is 1431 m deep (2013), the deepest cave in Croatia, 14th deepest cave in the world and the deepest cave in southeast Europe. [1] At its foot, there are ponds and streams including one of the largest known colonies of subterranean leeches ( Erpobdella mestrovi ), which has been ascertained to represent a new species, genus ...
Replica of a Mylodon inside the cave The "Devil's Chair" at the entrance of the monumental cave Interior of the largest cave. Cueva del Milodón Natural Monument is a Natural Monument located in the Chilean Patagonia, [1] 24 km (15 mi) northwest of Puerto Natales and 270 km (168 mi) north of Punta Arenas.