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Ercitite

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Formula:
Na2Mn3+2(PO4)2(OH)2 · 4H2O
Colour:
Pale brown
Lustre:
Vitreous
Hardness:
3 - 4
Crystal System:
Monoclinic
Name:
Named in honor of T. Scott Ercit (1957-), Canadian mineralogist and crystallographer.
Structurally related to bermanite and mengeite.


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Classification of ErcititeHide

Approved
8.DJ.35

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1

Physical Properties of ErcititeHide

Vitreous
Colour:
Pale brown
Streak:
Beige
Hardness:
3 - 4 on Mohs scale

Optical Data of ErcititeHide

Type:
Biaxial (+)
RI values:
nα = 1.699 nβ = 1.715 nγ = 1.737
Max Birefringence:
δ = 0.038
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong

Chemical Properties of ErcititeHide

Formula:
Na2Mn3+2(PO4)2(OH)2 · 4H2O
IMA Formula:
NaMn3+(PO4)(OH) · 2H2O

Crystallography of ErcititeHide

Crystal System:
Monoclinic

Type Occurrence of ErcititeHide

Synonyms of ErcititeHide

Other Language Names for ErcititeHide

German:Ercitit
Spanish:Ercitita

Related Minerals - Nickel-Strunz GroupingHide

8.DJ.05JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.
8.DJ.05OlmsteaditeKFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2OOrth.
8.DJ.10GatumbaiteCaAl2(PO4)2(OH)2 · H2OMon. 2/m : P2/m
8.DJ.15CamgasiteCaMg(AsO4)(OH) · 5H2OMon. 2/m : P21/m
8.DJ.20Phosphofibrite(H2O,K)3.5Fe8(PO4)6(OH)7 · 5H2OMon. 2/m
8.DJ.20Meurigite-KKFe3+8(PO4)6(OH)7 · 6.5H2OMon. 2/m : B2/b
8.DJ.20Meurigite-NaNaFe3+8(PO4)6(OH)7 · 6.5H2OMon. 2/m : B2/b
8.DJ.25JungiteCa2Zn4Fe3+8(PO4)9(OH)9 · 16H2OOrth.
8.DJ.30WycheproofiteNaAlZr(PO4)2(OH) · H2OTric.
8.DJ.40MrázekiteBi2Cu3(PO4)2O2(OH)2 · H2OMon. 2/m
8.DJ.45AttikaiteCa3Cu2Al2(AsO4)4(OH)4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pban

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 ErcititeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
FRANSOLET, A.-M., COOPER, M.A., ERNÝ, P., HAWTHORNE, F.C., CHAPMAN, R. & GRICE, J.D. (2000): The Tanco pegmatite at Bernic Lake, southeastern Manitoba. XV. Ercitite, Na,Mn3+PO4(OH)(H2O)2, a new phosphate mineral species. Canadian Mineralogist 38, 893-898.
Cooper, M. A., Hawthorne, F. C. and Černý, P. (2009): The crystal structure of ercitite, Na2(H2O)4[Mn3+2(OH)2(PO4)2], and its relation to bermanite, Mn2+(H2O)4[Mn3+2(OH)2(PO4)2]. Canadian Mineralogist 47, 173-180.

Internet Links for ErcititeHide

Localities for ErcititeHide

ⓘ - 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 (TL)
 
  • Manitoba
    • Lac-du-Bonnet area
      • Bernic Lake
FRANSOLET, A.-M., COOPER, M.A., ERNÝ, P., HAWTHORNE, F.C., CHAPMAN, R. & GRICE, J.D. (2000): The Tanco pegmatite at Bernic Lake, southeastern Manitoba. XV. Ercitite, Na,Mn3+PO4(OH)(H2O)2, a new phosphate mineral species. Canadian Mineralogist 38, 893-898. Cooper, M. A., Hawthorne, F. C. and Černý, P. (2009): The crystal structure of ercitite, Na2(H2O)4[Mn3+2(OH)2(PO4)2], and its relation to bermanite, Mn2+(H2O)4[Mn3+2(OH)2(PO4)2]. Canadian Mineralogist 47, 173-180.
Mineral and/or Locality  
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