Plagioclase CL/OM measurement, Telfer & Walker 1978

Measurement details

Reference Telfer D. J. & Walker G. (1978). Ligand field bands of Mn2+ and Fe3+ luminescence centres and their site occupancy in plagioclase feldspars. Modern Geology, 6(4), 199-210.
Material Plagioclase [ (Na, Ca)[(Si, Al)AlSi2]O8 ]
Specimen temperature Ambient
Technique Cathodoluminescence (CL), using an optical microscope
Lines Mn2+ 321 nm, 305.6 nm, 340 nm, 295.4 nm, 355 nm, 284.6 nm, 404 nm, 248.3 nm, 421 nm, 239.3 nm, 487 nm, 208.7 nm, 559 nm

Composition

Nominal composition of Plagioclase [ (Na,Ca)[(Si,Al)AlSi2]O8 ].
Element Atoms
Na 0-1
Ca 0-1
Al 1-2
Si 2-3
O 8