Cryptomelane is a potassium manganese oxide mineral with formula K(Mn 4+,Mn 2+) 8 O 16. In 1942 the name cryptomelane was proposed as part of an effort to sort out the manganese oxide minerals referred to as psilomelane.
Visually indistinguishable from hollandite and several other manganese oxide minerals. Many manganese oxides are better identified using infra-red spectroscopy than by X-ray diffraction because of issues of crystal size, disorder, etc. (Potter and Rossman, 1979).
Cryptomelane definition is - a mineral consisting of an oxide of manganese and potassium, probably KMn8O16.H2O, common in manganese ores.
Cryptomelane, described formally as a species in 1982, has a name which comes from the Greek words for "hidden" and "black," since in practice it is often hard to distinguish from other black, massive manganese oxides with which it mixes intimately (www.
PE Cryptomelane = 16.25 barns/electron U=PE Cryptomelane x r electron = 66.76 barns/cc. Radioactivity: GRapi = 72.57 (Gamma Ray American Petroleum Institute Units) Concentration of Cryptomelane per GRapi unit = 1.38 (%) Estimated Radioactivity from Cryptomelane - barely detectable : Cryptomelane Classification: Dana Class: 07.09.01.02 Multiple ...
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Media in category "Cryptomelane" The following 2 files are in this category, out of 2 total.
(iv) Cryptomelane exists initially only within a limited size range, with surface area ∼50–350 m 2 /g (2, 11), when synthesized in the laboratory under ambient conditions. Again, given enough time and thermodynamic driving forces, macroscale size may be achieved, especially in natural materials.
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The structure of cryptomelane is comprised of 2 × 2 edge-shared MnO 6 octahedral chains, which are corner-connected to form 1D channels of ca. 0.46 nm × 0.46 nm. The authors thought this tunnel size was suitable for the adsorption of HCHO and determined the catalytic activity other than other factors such as the specific surface area.