Mineralogy Database

Cryptomelane Mineral Data

Search Webmineral :

General Cryptomelane Information

Help on Chemical  Formula: Chemical Formula: K(Mn++++,Mn++)8O16
Help on Composition: Composition: Molecular Weight = 734.59 gm
   Potassium   5.32 %  K     6.41 % K2O
   Manganese  59.83 %  Mn   19.31 % MnO / 71.01 % MnO2
   Oxygen     34.85 %  O
             ______        ______ 
             100.00 %       96.73 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KMn4+6Mn2+2O16
Help on Environment: Environment: Commonest of the hard, black, fine-grained manganese oxides formerly called psilomelane.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1942
Help on Locality: Locality: Chindwara, India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for hidden and black, as the identity of this common, black mineral is lost in the group of other black Mn-bearing oxides.
Help on Name Pronunciation: Name Pronunciation: Cryptomelane + Pronunciation Say CRYPTOMELANE
Help on Synonym: Synonym: Psilomelane