Cookeite [ (Al,Li)3Al2(Si,Al)4O10(OH)8 ]

Image of Cookeite

Material properties

Formula (Al,Li)3Al2(Si,Al)4O10(OH)8
Abbreviation Ckt
Classifications Minerals containing OH, Chlorite (group)
Luminescence emitters O, OH
IMA Status Grandfathered (pre-IMA), 1866
Search other databases webmineral.com, mindat.org, rruf.info, fluomin.org, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags Hydroxide , Mineral, Aluminosilicate

Composition

Element Atoms
O 18
Si 3
H 8
Li 1
Al 5
Total: 35

References for Cookeite

Reference
Lines Spectra Images
Kuznetsov et al. 1991 1 0 0
CSIRO Reflectance (2025) 1 0 0

Specimens of Cookeite

Name Owner Materials Phase purity Image Spectra Techniques
MES125 Cookeite / Elbaite CSIRO Cookeite (82.0%), Elbaite 82.0 0 —
MES300 Microcline / Cookeite / Albite CSIRO Albite, Cookeite (25.0%), Microcline, Muscovite-1M, Muscovite-2M1, Quartz 25.0 1 Reflectance
M1850 Quartz / Eucryptite / Cookeite CSIRO Clinochlore, Fe, Cookeite (10.0%), Eucryptite, Kaolinite, poorly crystalline, Quartz 10.0 1 Reflectance
M2843 Quartz / Eucryptite CSIRO Clinochlore, Fe, Cookeite (9.0%), Eucryptite, Kaolinite, poorly crystalline, Prehnite, Quartz 9.0 1 Reflectance
PSP_E Eucryptite / Quartz / Kaolinite CSIRO Cookeite (6.0%), Eucryptite, Kaolinite, poorly crystalline, Pollucite, Quartz 6.0 1 Reflectance
MES124 Microcline / Hambergite / Albite CSIRO Albite, Ankerite, Cookeite (1.0%), Hambergite, F, Microcline, Orthoclase, Quartz 1.0 0 —