article_snippet.sent: This slowly growing mound of white and orange calcite is one of the larger deposits along the river passage .
article_snippet.sent: The Giant Gour in the Oxbow area of The Tham Khoun Ex cave is 60 metres long and is probably one of the worldís largest rimstone basins .
article_snippet.sent: American cave explorer Dave Pierce marvels at giant cave pearls which grow like pearls in an oyster with concentric layers of calcite slowly building up year after year .
article_snippet.sent: The subterranean passage of the river is spectacularly decorated with calcified formations .
article_snippet.sent: The Giant Gour in the Oxbow area of the cave the Oxbow area of the cave is 196 feet long and is probably one of the world's largest rimstone basins.
article_snippet.sent: The rims of basins like this grow taller each year as calcite precipitates from cave water as it flows faster over protrusions .