Below is a partial list of precious and semi-precious stones many of which can be found somewhere in the West Bend grottos. A short description is added to enable those interested to identify them. A variegated, waxy quartz in which the colors are in bands. Many excellent specimens of agate are to be found in the Christmas Chapel and incorporated in the Stations of the Cross. A variety of chrysoberl from the emerald mines on the Takowaya River, Ural Mountains, Russia.
Predominant colors are green and columbine red.
Very little will be found in the exposed parts of the grotto because amber is soft and likely to be affected by weathering. Quartz with clear purple or violet color. Specimens found here are from Brazil and from the Andes mountains in South America. Barium sulfate, brownish tan, abundant in Grotto. A vitreous green hexagonal shaped aluminum silicate.