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About CafarsiteHide

Ca5.9Mn1.7Fe3Ti3(AsO3)12 · 4-5H2O
Chemical formula soon to be changed to either Ca16(Na,Fe2+,REE)(Ti,Fe3+,Fe2+,Mn2+,Al)16(AsO3)28F or Ca16(Na,Fe2+,REE)(Ti,Fe3+,Al)12(Fe2+,Mn)4(AsO3)28F. Fluorine is essential.
Dark brown
5½ - 6
Specific Gravity:
Crystal System:
For the elements in its composition.
This page provides mineralogical data about Cafarsite.

Classification of CafarsiteHide


4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
C : Arsenites, antimonites, bismuthites; without additional anions, with H2O

1 : Miscellaneous

20 : Arsenates (also arsenates with phosphate, but without other anions)
5 : Arsenates of Ti and Pb

Pronounciation of CafarsiteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of CafarsiteHide

Dark brown
5½ - 6 on Mohs scale
3.9 g/cm3 (Measured)    3.5 g/cm3 (Calculated)

Optical Data of CafarsiteHide

RI values:
n = 2.2
Isotropic minerals have no birefringence
Surface Relief:
Very High

Chemical Properties of CafarsiteHide

Ca5.9Mn1.7Fe3Ti3(AsO3)12 · 4-5H2O

Chemical formula soon to be changed to either Ca16(Na,Fe2+,REE)(Ti,Fe3+,Fe2+,Mn2+,Al)16(AsO3)28F or Ca16(Na,Fe2+,REE)(Ti,Fe3+,Al)12(Fe2+,Mn)4(AsO3)28F. Fluorine is essential.
IMA Formula:

Crystallography of CafarsiteHide

Crystal System:
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Cell Parameters:
a = 15.984 Å
Unit Cell V:
4,083.72 ų (Calculated from Unit Cell)
Space-group Pn-3 (symbol shown above is wrong - Mindat bug).

Type Occurrence of CafarsiteHide

Synonyms of CafarsiteHide

Other Language Names for CafarsiteHide

Simplified Chinese:砷钛铁钙石
Traditional Chinese:砷鈦鐵鈣石

Common AssociatesHide

Associated Minerals Based on Photo Data:
10 photos of Cafarsite associated with QuartzSiO2
8 photos of Cafarsite associated with Agardite
5 photos of Cafarsite associated with MagnetiteFe2+Fe3+2O4
4 photos of Cafarsite associated with HematiteFe2O3
3 photos of Cafarsite associated with AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2
3 photos of Cafarsite associated with FluoriteCaF2
2 photos of Cafarsite associated with MuscoviteKAl2(AlSi3O10)(OH)2
2 photos of Cafarsite associated with SenaitePb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38
1 photo of Cafarsite associated with Ripidolite(Mg,Fe,Al)6(Si,Al)4O10(OH)8
1 photo of Cafarsite associated with CrichtoniteSr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38

Related Minerals - Nickel-Strunz GroupingHide

4.JC.10Lazarenkoite(Ca,Fe2+)Fe3+As3+3O7 · 3H2OOrth.
4.JC.15RouseitePb2Mn2+[AsO3]2 · 2H2OTric.
4.JC.20Vajdakite[(Mo6+O2)2(H2O)2As3+2O5] · 3H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.5.2SchultenitePb(HAsO4)Mon. 2/m : P2/b
20.5.3DuftitePbCu(AsO4)(OH)Orth. 2 2 2 : P21 21 21
20.5.4BayldonitePbCu3(AsO4)2(OH)2Mon. 2/m : B2/b
20.5.6ArsendescloizitePbZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
20.5.7HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2OTric.
20.5.8ThometzekitePbCu2+2(AsO4)2 · 2H2OMon. 2/m : B2/m
20.5.9Caryinite(Na,Pb)(Ca,Na)CaMn2+2(AsO4)3Mon. 2/m
20.5.10LudlockitePbFe3+4As3+10O22Tric. 1 : P1
20.5.11GabrielsonitePbFe3+(As3+O3)OOrth. mm2 : Pmc21
20.5.12CarminitePbFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
20.5.13SegnititePbFe3+3AsO4(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
20.5.14TsumcoritePbZn2(AsO4)2 · 2H2OMon.
20.5.16MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)Mon.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for CafarsiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Graeser, S. (1966): Asbecasit und Cafarsit, zwei neue Mineralien aus dem Binnatal (Kt. Wallis). Schweizerische Mineralogische und Petrographische Mitteilungen 46, 367-375 (in German).
American Mineralogist: 52 (1967) 1584.
Edenharter, A., Nowacki, W., Weibel, M. (1977): Zur Struktur und Zusammensetzung von Cafarsit, ein As(III)-oxid, kein Arsenat [The structure and composition of cafarsite. Cafarsite, an arsenic(III) oxide without arsenate groups. Schweizerische Mineralogische und Petrographische Mitteilungen 57, 1-16 (in German).
American Mineralogist: 63 (1978) 795.
Kloprogge, J.T. & Frost, R.L. (1999): Raman microscopy study of cafarsite. Appl. Spectrosc. 53, 874-880.
Gatta, G.D., Rotiroti, N., Cámara, F., Meven, M. (2018): On the labyrinthine world of arsenites: a single-crystal neutron and X-ray diffraction study of cafarsite. Physics and Chemistry of Minerals: 45, 819-829.
Cametti, G., Nagashima. M., Armbruster, T. and Fisch, M. (2018): New data on cafarsite: reinvestigation of its crystal structure and chemical composition. European Journal of Mineralogy, 30, 859-868.

Internet Links for CafarsiteHide

Localities for CafarsiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Ontario
    • Thunder Bay District
      • Bomby Township
HARRIS, D.C. (1989): The mineralogy and geochemistry of the Hemlo gold deposit, Ontario. Geological Survey of Canada, Economic Geology Report 38.
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Ossola Valley
        • Antigorio Valley
          • Devero Valley
            • Baceno
              • Devero Alp
No reference listed
Albertini C. (1991): L'Alpe Devero ed i suoi minerali. Edizioni Grafica P.G.A., Dormelletto (Novara), 299 pp.; Guastoni A., Pezzotta F., Vignola P. (2006): Characterization and genetic inferences of arsenates, sulfates and vanadates of Fe, Cu, Pb, Zn from Mount Cervandone (Western Alps, Italy). Per. Mineral., 76, 141-150; Piccoli G.C., Maletto G., Bosio P., Lombardo B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" di Alba, Ed., Alba, 607 pp.; Guastoni A. (2009): Monte Cervandone. Recenti novità mineralogiche. Riv. Mineral. Ital., 33, 1 (1-2009), 38-48.
  • Valais
    • Binn Valley
      • Chummibort
Cuchet, S., van der Burgt, A. und Meisser, N. (2005): Chummibort, eine neue Fundstelle für Arsenmineralien im Binntal. Schweizer Strahler, Nr. 2, 19-29. (in German/French)
      • Kriegalp Valley (Chriegalp Valley)
Schweiz.Min.Petr.Mitt.(1966) 46, 367-375
      • Lercheltini area (Lärcheltini)
[MinRec 27:302]; American Mineralogist, Volume 79, pages 996-1002, 1994
Krzemnicki, M. (1992): As-Bi-Mineralisationen in der Monte-Leone-Decke im Mättital (Binntal-Region). Diplomarbeit, Universität Basel, Switzerland, 122 S.
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