Prehnite : CSIRO Spectroscopy Database

Prehnite [ Ca₂Al(Si₃Al)O₁₀(OH)₂ ]

Image of Prehnite

Specimen of prehnite, from Goboboseb Mountain, Erongo Region, Namibia. Specimen M 53300, Museums Victoria

Photo by Rodney Start, Copyright Museums Victoria / CC BY (Licensed as Attribution 4.0 International)

Material properties

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

Composition

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

References for Prehnite

Laukamp et al. 2021

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CSIRO Reflectance (2025)

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Tarashchan 1978

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Specimens of Prehnite

Name	Owner	Materials	Image	Spectra	Techniques
150 Prehnite	CSIRO	Diopside, Prehnite	150 Prehnite Image of Prehnite and Diopside in specimen '150 Prehnite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.	1	Reflectance
M2100 Meionite / Muscovite / Pumpellyite-(Mg)	CSIRO	Meionite, Muscovite-1M, Muscovite-2M1, Prehnite, Pumpellyite-(Mg), Cr, Scapolite	M2100 Meionite / Muscovite / Pumpellyite-(Mg) Image of Scapolite, Meionite, Muscovite-1M, Muscovite-2M1, Prehnite and Pumpellyite-(Mg) (var. Cr) in specimen 'M2100 Meionite / Muscovite / Pumpellyite-(Mg)' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	1	Reflectance
M2843 Quartz / Eucryptite	CSIRO	Clinochlore, Fe, Cookeite, Eucryptite, Kaolinite, poorly crystalline, Prehnite, Quartz	M2843 Quartz / Eucryptite Image of Eucryptite, Clinochlore (var. Fe), Cookeite, Kaolinite (var. poorly crystalline), Prehnite and Quartz in specimen 'M2843 Quartz / Eucryptite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	1	Reflectance
MT8407 Meionite / Prehnite	CSIRO	Kaolinite, Meionite, Montmorillonite, Muscovite-1M, Muscovite-2M1, Prehnite, Pumpellyite-(Mg), Cr, Scapolite	MT8407 Meionite / Prehnite Image of Scapolite, Kaolinite, Meionite, Montmorillonite, Muscovite-1M, Muscovite-2M1, Prehnite and Pumpellyite-(Mg) (var. Cr) in specimen 'MT8407 Meionite / Prehnite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	1	Reflectance