Amethyst stalactites are found in some geode formations and are commonly cut and polished when they are not of collector quality.This is a cross-sectional slice of an amethyst crystal covered agate stalactite. There are concentric bands of green and clear agates that are ringed by transparent amethyst crystals. This piece has been polished to a glass luster front and rear. The perimeter is natural. This slice measures 1 x 13/16 x 1/8 inches or 25 x 21 x 4 mm.