alkali feldspar

(redirected from alkali feldspars)
Also found in: Dictionary.

alkali feldspar

[′al·kə‚lī ′feld‚spar]
(mineralogy)
A feldspar composed of potassium feldspar and sodium feldspar, such as orthoclase, microcline, albite, and anorthoclase; all are considered alkali-rich.
References in periodicals archive ?
Palaeodosimetrical properties of sodium alkali feldspars and problems of luminescence dating of sediments.
Check of the validity of the common laboratory treatments used for luminescence dating on the basis of alkali feldspars by IR OSL spectra.
This hypothesis is supported by pulse annealing of the OSL signal in quartz and alkali feldspars (Fig.
Models of the OSL processes in alkali feldspars and quartz
The prevailing mechanism of the OSL processes in alkali feldspars by using the IR band of stimulation was proposed already more than ten years ago by Hutt et al.
Using visible stimulation the thermal influence on the processes of deep traps ionization has also been revealed in the case of quartz and alkali feldspars.
2001) we explained the photoionization of the deep traps in quartz and in the short-wave stimulation bands of alkali feldspars as transitions from the different vibrational levels of the ground state to quasilocal states, which are overlapped by the conduction band.
Jaek reported on the 9th International Conference on Luminescence and Electron Spin Resonance Dating, Rome, 1999 that the effect of the short-wave region of the spectrum of the Sun on alkali feldspars is excitative, and bleaching at the same time (saving of the light sum takes place).
Study of deep traps in alkali feldspars and quartz by the optically stimulated afterglow.