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Cafarsite

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Formula:
Ca5.9Mn1.7Fe3Ti3(AsO3)12 · 4-5H2O
System:
Isometric
Colour:
Dark brown
Hardness:
5½ - 6
Name:
For the elements in its composition.
This page provides mineralogical data about Cafarsite.

Classification of Cafarsite

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
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Type Occurrence of Cafarsite

Year of Discovery:
1966

Physical Properties of Cafarsite

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

Crystallography of Cafarsite

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Pn3
Cell Parameters:
a = 15.984Å
Unit Cell Volume:
V 4,083.72 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Cubo-octahedron

Optical Data of Cafarsite

Type:
Isotropic
RI values:
n = 2.2
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Very High

Chemical Properties of Cafarsite

Formula:
Ca5.9Mn1.7Fe3Ti3(AsO3)12 · 4-5H2O
Essential elements:
All elements listed in formula:

Relationship of Cafarsite to other Species

4.JC.10Lazarenkoite(Ca,Fe2+)Fe3+As33+O7 · 3H2O
4.JC.15RouseitePb2Mn2+[AsO3]2 · 2H2O
4.JC.20Vajdakite[(Mo6+O2)2(H2O)2As23+O5] · 3H2O
20.5.2SchultenitePb(HAsO4)
20.5.3DuftitePbCu(AsO4)(OH)
20.5.4BayldonitePbCu3(AsO4)2(OH)2
20.5.5PhilipsbornitePbAl3(AsO4)2(OH)5 · H2O
20.5.6ArsendescloizitePbZn(AsO4)(OH)
20.5.7HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
20.5.8ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
20.5.9Caryinite(Na,Pb)(Ca,Na)(Ca,Mn2+)(Mn2+,Mg,Fe3+)2(AsO4)3
20.5.10LudlockitePbFe43+As103+O22
20.5.11GabrielsonitePbFe(AsO4)(OH)
20.5.12CarminitePbFe23+(AsO4)2(OH)2
20.5.13SegnititePbFe33+(AsO4)2(OH,H2O)6
20.5.14TsumcoritePb(Zn,Fe3+)2(AsO4)2 · 2(H2O,OH)
20.5.15JamesitePb2Zn(Fe2+,Zn)2Fe43+(AsO4)4(OH)10
20.5.16MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
20.5.17Arsenbrackenbuschite

Other Names for Cafarsite

Name in Other Languages:
German:Cafarsit
Simplified Chinese:砷钛铁钙石
Spanish:Cafarsita
Traditional Chinese:砷鈦鐵鈣石

Other Information

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 Cafarsite

Reference List:
American Mineralogist: 52: 1584.

American Mineralogist: 63: 795.

Schweizerische mineralogische und petrographische Mitteilungen: 57: 1-16.

Internet Links for Cafarsite

Specimens:
The following Cafarsite specimens are currently listed for sale on minfind.com.

Localities for Cafarsite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • Ontario
    • Thunder Bay District
      • Bomby Township
ontariominerals.com
Italy
 
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Ossola Valley
        • Antigorio Valley
          • Devero Valley
            • Baceno
              • Devero Alp
No reference listed
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
Switzerland
 
  • Wallis (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.
Mineral and/or Locality  
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