a. The phenomenon observed when a pleochroic mineral is rotated in plane polarized light. In certain positions, the mineral is darker than in others, owing to the absorption of light.
b. In hydrology, a term applied to the entrance of surface water into the lithosphere by all methods. AGI
c. The reduction of light intensity in transmission through an absorbing substance or in reflection from a surface. In crystals, the absorption may vary with the wavelength and with the electric vector of the transmitted light with respect to crystallographic directions.
d. Any mechanism by which energy, e.g., electromagnetic or seismic, is converted into heat.
e. Taking up, assimilation, or incorporation, e.g., of liquids in solids or of gases in liquids. CF: adsorption
f. The entrance of surface water into the lithosphere by any method.
Source:
Dictionary of Mining, Mineral, and Related Terms












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