Carnallite

 

First discovered in 1856, this mineral was named after Rudolf von Carnall (1804-1874), a Prussian mining engineer. It is found in saline marine deposits by action of high potash fluids such as deposits in Stassfurt, Germany and eastern New Mexico. It is a source of potassium and magnesium.

Mineral Photos courtesy of R.Weller/Cochise College