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Raft Cones, Moonscape, Blue Spring Cave, White Co, TN | by Chuck Sutherland
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Raft Cones, Moonscape, Blue Spring Cave, White Co, TN

"Raft Cone Formation: At the surface of the water a slim coating of calcite (called calcite rafts) can form as the water evaporates from the calcite saturated pool. When a drop of calcite saturated water falls from above it breaks the surface tension of the water causing a small pile of calcite to sink to the bottom of the pool. When the drops of water keep coming from the same spot - and landing in the same spot - the calcite at the bottom of the pool starts to form these small tower shapes called raft cones. The name comes from the calcite rafts that first formed at the surface and the cone shape created as they build up over time." source - www.hutchk12.org/geo/mngeo/page60.html

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Taken on January 14, 2012