Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Hydrocalumite from
Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France


07257950017272086979330.jpg
Hydrocalumite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
05851640017272025463492.jpg
Hydrocalumite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
09462460017272025465838.jpg
Hydrocalumite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
04411490017272025472703.jpg
Hydrocalumite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
07257950017272086979330.jpg
Hydrocalumite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
05851640017272025463492.jpg
Hydrocalumite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
09462460017272025465838.jpg
Hydrocalumite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
04411490017272025472703.jpg
Hydrocalumite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
07257950017272086979330.jpg
Hydrocalumite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
08864380017272025496177.jpg
Hydrocalumite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
02281620017272025501089.jpg
Hydrocalumite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
05736400017777694137392.jpg
Hydrocalumite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Locality type:Quarry
Classification
Species:Hydrocalumite
Formula:Ca4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
Comments:Chlorinated hydrocalumite : Ca3.852 Mg0.136 Na0.018 Al2 (OH)12.74 (CO3)0.124 Cl0.958 . 4H2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Ettringite6
Calcite2
Data
Mineral Data:Click here to view Hydrocalumite data
Locality Data:Click here to view Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Photo GalleryView Gallery (8 photos)
Data Identifiers
Mindat Occurrence Record ID:282007
Long-form Identifier:1:3:282007:1
GUID (UUID V4):0
References
Grünhagen, H.; Mergoil, Juliette (1963) Découverte d'hydrocalumite et afwillite associées à l'ettringite dans les porcélanites de Boisséjour près Ceyrat (Puy-de-Dôme). Bulletin de Minéralogie, 86 (2). 149-157 doi:10.3406/bulmi.1963.8308
Zhitova, Elena S.; Sheveleva, Rezeda M.; Zolotarev, Andrey A.; Ferraris, Cristiano; Kupchinenko, Anastasia N.; Sysoeva, Elizaveta K.; Bocharov, Vladimir N.; Krivovichev, Sergey V.; Pekov, Igor V. (2026) Reinvestigation of hydrocalumite, Ca4Al2(OH)12Cl(CO3)0.5·5H2O – a natural layered double hydroxide, calcium hydrated aluminate and AFm phase. Mineralogical Magazine, 1-30 doi:10.1180/mgm.2026.10207
 
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