The cavern is yellow, brown or red because of water, chemicals and minerals. The new stalactites growing from the old, and made of hard carbonates that had already once been used, are usually white as snow though often pink or amber-colored. The Empress Column is a stalagmite high, rose-colored, and elaborately draped. The Double Column, named from Professors Henry and Baird, is made of two fluted pillars side by side, the one the other high, a mass of snowy alabaster. Several stalactites in Giant's Hall exceed in length. The Pluto's Ghost, a pillar, is a ghostly white.