What color is stalagmite?

Answer 1

Primary colour: white. Calcite itself is transparent but in mass the crystals give a white effect in the same way as sugar or snow. A "straw" (in US caving, "soda straw") stalactite is so thin it is nearly transparent.

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Mineral (metallic) impurities naturally present within the source limestone often tint stalagmites and their fellow "speleothems, usually to a buff or yellowy-cream colour, but shades of brown or red (from iron) or blue (from copper) are known, although rare.

Answer 2

Stalagmites can vary in color depending on the minerals present in the water that forms them. They are often white, yellow, brown, or red due to the presence of minerals such as calcium carbonate, iron oxide, or manganese oxide.