cryptomelane

cryptomelane

[¦krip·tō·mə′lān]
(mineralogy)
KMn8O16·H2O A usually massive mineral, common in manganese ores; contains an oxide of manganese and potassium and crystallizes in the monoclinic system.
References in periodicals archive ?
Researchers from the Department of Energy's Pacific Northwest National Laboratory (PNNL) revealed earlier this month during the 230th national meeting of the American Chemical Society in Washington, DC, that the mineral cryptomelane "holds promise to absorb the toxic sulfur oxides that can degrade the emission control systems on diesel vehicles.
According to PNNL, laboratory researchers have identified the potential for using cryptomelane to trap sulfur dioxide and sulfur trioxide from diesel engine emissions on monolith supports.
PNNL noted that cryptomelane has a "very high" capacity for absorbing sulfur dioxide -- more than 10 times as high as those of standard metal oxide-based absorbents.
The PNNL researchers tested cryptomelane under diesel engine conditions that are being proposed to trap nitrogen oxides.