The chemical equation for the formation of stalactites is Ca(OH)2+CO2=CACO3+H2O, CACO3+CO2+H2O=CA(HCO3)2.

In the limestone, water containing carbon dioxide seeps into the cracks of the limestone and reacts with calcium carbonate to form calcium bicarbonate that is soluble in water. When the water with dissolved calcium bicarbonate drips from the roof of the cave, The decomposition reaction produces calcium carbonate, carbon dioxide, and water. The dissolved calcium bicarbonate becomes solid again. Those that gradually grow from top to bottom are called "stalactites".

Medicine identification

Character identification This product is a stalactite-like aggregate. Most of them are cylindrical or conical, with different lengths and thicknesses. The surface is white, off-white or brown, rough and uneven. Weight, hard, easy to smash, relatively flat cross-section, white to light grayish white, slightly light brown, with star-like light when observed under the light, often with a round hole near the center, and many light orange-yellow concentric rings around the round hole. layers, some with visible radial texture. Odorless, slightly salty taste. The best ones are white or off-white in color, round in any shape, and shining like stars in the cross-section.

Reference for the above content: Baidu Encyclopedia-Stalactites