A discredited name for material primarily containing pimelite.
A discredited name for material primarily containing pimelite.
A poorly defined material, possibly altered biotite or interlayer-deficient biotite, and/or vermiculite.
A weathering process wherein minerals in a soil release iron which subsequently precipitates to form free iron oxides, such as hematite (red) and goethite (yellow brown), to produce reddening of a soil horizon.
A poorly defined term, possibly for a Si-poor chlorite.