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Cafarsite

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About CafarsiteHide

Formula:
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.
Colour:
Dark brown
Hardness:
5½ - 6
Specific Gravity:
3.9
Crystal System:
Isometric
Name:
For the elements in its composition.
This page provides mineralogical data about Cafarsite.


Classification of CafarsiteHide

Approved
4.JC.05

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
45.1.4.1

45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
20.5.1

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

Pronounciation of CafarsiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of CafarsiteHide

Transparency:
Opaque
Colour:
Dark brown
Streak:
Yellow-brown
Hardness:
5½ - 6 on Mohs scale
Fracture:
Conchoidal
Density:
3.9 g/cm3 (Measured)    3.5 g/cm3 (Calculated)

Optical Data of CafarsiteHide

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

Chemical Properties of CafarsiteHide

Formula:
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:
(Ca,Na,◻)19Ti8Fe3+4Fe2+4(AsO3)28F

Crystallography of CafarsiteHide

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Pn3
Cell Parameters:
a = 15.984 Å
Unit Cell V:
4,083.72 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Cuboctahedra.
Comment:
Space-group Pn-3 (symbol shown above is wrong - Mindat bug).

Type Occurrence of CafarsiteHide

Synonyms of CafarsiteHide

Other Language Names for CafarsiteHide

German:Cafarsit
Simplified Chinese:砷钛铁钙石
Spanish:Cafarsita
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
20.5.5PhilipsbornitePbAl3(AsO4)(AsO3OH)(OH)6Trig.
20.5.6ArsendescloizitePbZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
20.5.7HelmutwinkleritePbZn2(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.
20.5.15JamesitePb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10Tric.
20.5.16MawbyitePbFe3+2(AsO4)2(OH)2Mon.
20.5.17ArsenbrackenbuschitePb2Fe3+(AsO4)2(OH)

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.
Canada
 
  • 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.
Italy
 
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • 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.
Switzerland
 
  • Valais
    • Goms
      • Binn
        • Lercheltini area (Lärcheltini)
[MinRec 27:302]; American Mineralogist, Volume 79, pages 996-1002, 1994
Schweiz.Min.Petr.Mitt.(1966) 46, 367-375
    • Östlich Raron
      • Grengiols
        • 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)
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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