Soda straw
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A soda straw is a speleothem in the form of a hollow mineral cylindrical tube. They are also known as tubular stalactites. Soda straws grow in places where water leaches slowly through cracks in rock,
Straws (stalactite precursors) in Gardner's Gut cave in New Zealand
A soda straw
Calthemite straw with varying external diameter, influenced by changes in drip rate over time, during its growth
Cave popcorn
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Cave popcorn, or coralloids, are small nodes of calcite, aragonite, or gypsum that form on surfaces in caves, especially limestone caves. They are a common type of speleothem.
Cave popcorn with frostwork
Alisadr Cave, Hamedan, Iran
Cave popcorn trays
Button cave popcorn