Copper staining on cave formations from tourists throwing coins into lucky pool of water Caverns of Sonora Texas USA

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Size: 3543px × 5315px
Photo credit: © Chris Howes/Wild Places Photography / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: america, calcite, cave, caverns, coins, copper, formation, green, money, north, pool, showcave, sonora, speleothem, stain, stained, states, texas, united, usa, water