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AH_Straw Tubular Stalactite Cave Slovenia_6403.jpg
Straw or Tubular Stalactites are very deilcate, hollow structures. They form when calcium carbonate or calcium sulfate dissolved in the water comes out of solution and is deposited in a ring around the outside of each successive drop as it hangs from the end of the stalactite. This example was photographed in a karstic cave in Slovenia.