Alkali feldspar [ (Na,K)AlSi3O8 ]

Image of Alkali feldspar

Material properties

Formula (Na,K)AlSi3O8
Abbreviation Afs
IMA Status Approved group
Classification Feldspar (group)
Members Kokchetavite, Sanidine (var. high), Rubicline, Ferrisanidine, Albite, K feldspar, Sanidine, Anorthoclase
Variants Microcline perthite, lunar
Luminescence emitters AlO4, Al-O- -Al, Eu, Fe, Trapped hole
Reflectance line Si-O
Spectra Luminescence (1)
Search other databases webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags Aluminosilicate, Silicate, Subgroup, Variety

Composition

Element Atoms
O 8
Al 1
Si 3
Na ~0.5
K ~0.5

References for Alkali feldspar

Reference
Lines Spectra Images
Kirsh & Townsend 1988 9 0 0
Kuznetsov and Tarashchan 1988 1 0 0
CSIRO/WUStL Apollo 12 (2019) 1 1 0
White 1974, reflectance 1 0 0
White 1974, reflectance, other 2 0 0

Specimens of Alkali feldspar

Name Owner Materials Image Spectra Techniques
Apollo 12032-366-19x NASA Alkali feldspar (var. lunar), Apatite (var. lunar), Baddeleyite (var. lunar), Fayalite (var. lunar), Hedenbergite (var. lunar), Ilmenite (var. lunar), Merrillite (var. lunar), Plagioclase (var. lunar), Silica (var. lunar), Troilite (var. lunar), Zirconolite (var. lunar) 6 CL