Prehnite [ Ca2Al(Si3Al)O10(OH)2 ]

Image of Prehnite

Material properties

Formula Ca2Al(Si3Al)O10(OH)2
Abbreviation Prh
IMA Status Grandfathered (pre-IMA), 1788
Crystal symmetry Orthorhombic, Point group mm2
Classification Minerals containing OH
Luminescence emitter Mn
Reflectance lines M2OH, M[n]OH, OH
Spectra Reflectance (1)
Search other databases webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags Aluminosilicate, Hydroxide, Mineral

Composition

Element Atoms
O 12
Al 2
Si 3
H 2
Ca 2
Total: 21

References for Prehnite

Reference
Lines Spectra Images
Laukamp et al. 2021 6 0 0
CSIRO Reflectance (2025) 0 1 0
Tarashchan 1978 1 0 0
White et al. 2017 12 0 0

Specimens of Prehnite

Name Owner Materials Phase purity Image Spectra Techniques
150 Prehnite CSIRO Diopside, Prehnite (95.1%) 95.1 1 Reflectance
MT8407 Meionite CSIRO Kaolinite, Meionite, Montmorillonite, Muscovite, Muscovite-1M, Muscovite-2M1, Prehnite (10.2%), Pumpellyite-(Mg) (var. Cr), Scapolite (group) 10.2 1 Reflectance
M2100 Scapolite CSIRO Meionite, Muscovite, Muscovite-1M, Muscovite-2M1, Prehnite (5.6%), Pumpellyite-(Mg) (var. Cr), Scapolite (group) 5.6 1 Reflectance
M2843 Eucryptite CSIRO Clinochlore (var. Fe), Cookeite, Eucryptite, Kaolinite (var. poorly crystalline), Prehnite (3.0%), Quartz 3.0 1 Reflectance