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Sewardite

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Terry M. Seward
Formula:
CaFe3+2(AsO4)2(OH)2
Colour:
Dark red to light orange
Lustre:
Vitreous
Crystal System:
Orthorhombic
Member of:
Name:
Named in honour of Terry Maxwell Seward (b. 1940), Canadian geochemist, Professor of Geochemistry, Institut für Mineralogie und Petrographie, ETH (Swiss Federal Institute of Technology), Zürich, Switzerland. Seward’s research focuses on the chemistry of fluids on and in the earth’s crust, including low temperature aqueous systems, metal speciation, dispersion of heavy metals connected with toxic waste disposal and sea-floor hydrothermal systems.
The calcium analogue of Carminite.


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Classification of SewarditeHide

Approved
8.BH.30

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1

Pronounciation of SewarditeHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of SewarditeHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Dark red to light orange
Streak:
Reddish-brown

Chemical Properties of SewarditeHide

Formula:
CaFe3+2(AsO4)2(OH)2

Crystallography of SewarditeHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cccm
Cell Parameters:
a = 16.461 Å, b = 7.434 Å, c = 12.131 Å
Ratio:
a:b:c = 2.214 : 1 : 1.632
Unit Cell V:
1,484.48 ų (Calculated from Unit Cell)

Type Occurrence of SewarditeHide

Synonyms of SewarditeHide

Other Language Names for SewarditeHide

German:Sewardit
Simplified Chinese:砷钙铁矿
Spanish:Sewardita
Traditional Chinese:砷鈣鐵礦

Relationship of Sewardite to other SpeciesHide

Member of:
Other Members of this group:
CarminitePbFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
CrimsonitePbFe3+2(PO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm

Common AssociatesHide

Associated Minerals Based on Photo Data:
Carminite7 photos of Sewardite associated with Carminite on mindat.org.
Arseniosiderite3 photos of Sewardite associated with Arseniosiderite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.BH.05ThadeuiteCa(Mg,Fe2+)3(PO4)2(OH,F)2Orth. 2 2 2 : C2 2 21
8.BH.10DurangiteNaAl(AsO4)FMon. 2/m : B2/b
8.BH.10IsokiteCaMg(PO4)FMon. 2/m : B2/b
8.BH.10LacroixiteNaAl(PO4)FMon. 2/m : B2/b
8.BH.10MaxwelliteNaFe3+(AsO4)FMon.
8.BH.10PanasqueiraiteCaMg(PO4)(OH,F)Mon.
8.BH.10TilasiteCaMg(AsO4)FMon. m : Bb
8.BH.15DrugmanitePb2(Fe3+,Al)(PO4)(PO3OH)(OH)2Mon. 2/m : P21/b
8.BH.20Bjarebyite(Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3Mon.
8.BH.20CirroliteCa3Al2(PO4)3(OH)3 (?)
8.BH.20KulaniteBa(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3Mon.
8.BH.20PenikisiteBa(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20PerloffiteBa(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20JohntomaiteBaFe2+2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.25Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4Orth.
8.BH.25Palermoite(Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4Orth.
8.BH.30CarminitePbFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
8.BH.35AdeliteCaMg(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35ArsendescloizitePbZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35AustiniteCaZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35CobaltaustiniteCaCo(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35ConichalciteCaCu(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35DuftitePbCu(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35GabrielsonitePbFe(AsO4)(OH)Orth. mm2 : Pmc21
8.BH.35NickelaustiniteCaNi(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35TangeiteCaCu(VO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35GottlobiteCaMg(VO4,AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35HermannroseiteCaCu(PO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.40ČechitePbFe2+(VO4)(OH)Orth. mmm (2/m 2/m 2/m)
8.BH.40DescloizitePbZn(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.40MottramitePbCu(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.40PyrobelonitePbMn2+(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.45BayldonitePbCu3(AsO4)2(OH)2Mon. 2/m : B2/b
8.BH.45VésigniéiteBaCu3(VO4)2(OH)2Mon. 2/m : B2/m
8.BH.50PaganoiteNiBi(AsO4)OTric.
8.BH.55JagoweriteBaAl2(PO4)2(OH)2Tric.
8.BH.60Attakolite(Ca,Sr)Mn(Al,Fe)4(HPO4,PO4)3(SiO4,PO4)(OH)4Mon. 2/m : B2/m
8.BH.65LeningraditePbCu3(VO4)2ClOrth. mmm (2/m 2/m 2/m) : Ibam

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 SewarditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Roberts, A.C., Cooper, M.A., Hawthorne, F.C., Criddle, A.J., Stirling, J.A.R. (2002) Sewardite, CaFe3+2(AsO4)2(OH)2, the Ca-analogue of carminite, from Tsumeb, Namibia: description and crystal structure. Canadian Mineralogist: 40: 1191-1198.
Kolitsch, U. (2002) Sewardite from the Mina Ojuela, Mexico: a second occurrence. Lapis 27(12), 43 (in German).

Internet Links for SewarditeHide

Localities for SewarditeHide

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.
France
 
  • Nouvelle-Aquitaine
    • Haute-Vienne
      • Nantiat
        • Vaulry
          • Vaulry Mines
Patrice Queneau Collection
Mexico
 
  • Durango
    • Mun. de Mapimí
      • Mapimí
Kolitsch, U. (2002): Sewardite from the Mina Ojuela, Mexico: a second occurrence. Lapis 27 (12), 43. (in German). Mineralogical Record (2003) 34:5 The Ojuela Mine
  • Sonora
    • Mun. de Benjamin Hill
Mikhail Murashko data
    • Mun. de Trincheras
      • La Mur
www.mindat.org/mesg-7-59761.html
Namibia (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Can Min 40 (2002), 1191
Mineral and/or Locality  
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