 Moon milk sometimes called Mondmal, also known as Mondmal or as Cape Milk is a white, creamy substance found inside limestone caves. It is a precipitate from limestone comprising aggregates of fine crystals of varying composition usually made of carbonates such as calcite, aragonite, hydro-magnosite, and slash or monohydro-calcite. There are several hypotheses concerning the origin of moon milk. One of these explains moon milk to be the result of bacterial action rather than from chemical reactions. According to this particular hypothesis, moon milk is thought to have been created by the bacterium macromonus bipunctatus. However, no microbiological studies have been carried out so far. Moon milk was originally explained as created by moon rays. It is possible that moon milk is formed by water that dissolves and softens the carcest of caves consisting of carbonates, and carries dissolved nutrients that can be used by microbes, such as aptanomycetes. As the microbial colonies grow, they trap and accumulate chemically precipitated crystals in the organic matter rich matrix forms that way. Perhaps these heterotrophic microbes, which produce CO2 as a waste product of respiration and possibly organic acids, help to dissolve the carbonate. Being soft, moon milk was frequently the medium for finger-fluiding, a form of prehistoric art. The world's largest formation of brush-eyed moon milk is found in the big room of Kirchner-Kavern State Park in southern Arizona. In the middle of 16th century moon milk was used as a medicine according to Gessner, and continued to be used as such until the 19th century. It is said to have cured acidosis and probably cardiology by neutralizing an overdose of acid. It had no adverse health effects.