| Name: | Cryptomelane Cml |
| IMA Chemistry: | K(Mn4+7Mn3+)O16 |
| Chemistry Elements: | The mineral Cryptomelane contains elements: Potassium (K) Manganese (Mn) Oxygen (O) |
| Country of Type Locality: | USA |
| Year First Published: | 1942 |
| IMA Status: | Approved |
| Status Notes: | Richmond W E, Fleischer M (1942) Cryptomelane, a new name for the commonest of the "psilomelane" minerals, American Mineralogist 27, 607-610 Formula changed from K(Mn^4+^,Mn^2+^)_8_O_16_: Biagioni C, Capalbo C, Pasero M (2013) Nomenclature tunings in the hollandite supergroup. European Journal of Mineralogy 25, 85-90 |
| Structural Group Name: | Coronadite |
| Fleischer's Group Name: | coronadite |
| Crystal Systems: | tetragonal|monoclinic |
| Oldest Known Age: | 3110 Million Years Ago |
| Mohs Hardness: | 6.25 |
| Diaphaneity: | 1.0 |
| Specific Gravity: | 4.29 |
| More Info: | Search Wikipedia: Cryptomelane (Wiki) Search Mindat: Cryptomelane Search Web Mineral DB: Cryptomelane |