Tags: Chemical Substance, Mineral.
Cryptomelane is a potassium manganese oxide mineral with formula K(Mn4+Mn2+)8O16.In 1942 the name cryptomelane was proposed as part of an effort to sort out the manganese oxide minerals referred to as psilomelane. Cryptomelane was identified and defined based on X-ray diffraction studies of samples from Tombstone Arizona; Deming New Mexico; Mena Arkansas; and Philipsburg Montana.Cryptomelane was approved in 1982 by the International Mineralogical Association (IMA).
