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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Afwillite from
Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France


05885260017366856595920.jpg
Afwillite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
05761480017272023461496.jpg
Afwillite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
07574980017272023458335.jpg
Afwillite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
00592310017366856609541.jpg
Afwillite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
05885260017366856595920.jpg
Afwillite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
05761480017272023461496.jpg
Afwillite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
05091150017366856606867.jpg
Afwillite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
00592310017366856609541.jpg
Afwillite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
05885260017366856595920.jpg
Afwillite

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
05761480017272023461496.jpg
Afwillite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
07574980017272023458335.jpg
Afwillite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
08357470017366856605431.jpg
Afwillite, etc.

Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Locality type:Quarry
Classification
Species:Afwillite
Formula:Ca3[SiO4][SiO2(OH)2] · 2H2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Ettringite5
Portlandite3
Data
Mineral Data:Click here to view Afwillite data
Locality Data:Click here to view Boisséjour, Beaumont, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Photo GalleryView Gallery (4 photos)
Data Identifiers
Mindat Occurrence Record ID:282006
Long-form Identifier:1:3:282006:4
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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