A process or phenomenon where a soil or clay mass has previously been subjected to pressures that were greater than the current overburden pressure.
A process or phenomenon where a soil or clay mass has previously been subjected to pressures that were greater than the current overburden pressure.
In soil science and soils engineering, the overconsolidation ratio (OCR) is the ratio of the preconsolidation effective stress to the current consolidation effective stress to which the soil is being subjected. For normally consolidated sediment the OCR = 1.0, thus for overconsolidated sediment the OCR >1.0.
A poorly defined material, possibly an altered iron-rich chlorite, from near Harper’s Ferry, West Virginia, USA.
A member of the brittle mica group, with an ideal chemical composition of Ba(Mg2Ti4+)Si2Al2O12. Oxykinoshitalite is the Ti and oxygenian dominant analogue of kinoshitalite. Oxykinoshitalite-1M forms in the C2/m space group with Ti primarily in the M2 site. It occurs in an olivine nephelinite from Fernando de Noronha Island, Pernambuco, Brazil (Kogarko et al., 2005).