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Fahleite

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About FahleiteHide

Rolf Fahle
Formula:
CaZn5Fe3+2(AsO4)6 · 14H2O
Colour:
Yellow, grey, bright-green
Lustre:
Silky, Pearly
Hardness:
2
Crystal System:
Orthorhombic
Name:
Named in honor of Rolf Fahle (1943– ), Munich, Germany, a mineral dealer specializing in Tsumeb minerals, who supplied the type specimen.
Apparently some samples of Mineral GS1 (of Gebhard) are in part identical to fahleite.


Classification of FahleiteHide

Approved
Approval Year:
1982
First Published:
1988
8.CH.55

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
40.5.8.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
20.3.21

20 : Arsenates (also arsenates with phosphate, but without other anions)
3 : Arsenates of Zn, Cd or Hg

Physical Properties of FahleiteHide

Silky, Pearly
Colour:
Yellow, grey, bright-green
Hardness:

Optical Data of FahleiteHide

Type:
Biaxial (+)
RI values:
nα = 1.628 nβ = 1.631 nγ = 1.656
2V:
Measured: 39° , Calculated: 40°
Max Birefringence:
δ = 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak to distinct

Chemical Properties of FahleiteHide

Formula:
CaZn5Fe3+2(AsO4)6 · 14H2O

Crystallography of FahleiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 6.4 Å, b = 11.72 Å, c = 21.9 Å
Ratio:
a:b:c = 0.546 : 1 : 1.869
Unit Cell V:
1,642.68 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
22 (100)
11 (100)
3.2 (80)
2.9 (50)
1.65 (20)
Comments:
Poorly crystalline; only five diffuse lines.

Type Occurrence of FahleiteHide

Reference:
Medenbach, O., Schmetzer, K., Abraham, K. (1988) Fahleite from Tsumeb/Namibia, a new mineral belonging to the smolianinovite group. Neues Jahrbuch für Mineralogie, Monatshefte: 1988: 167-171.

Synonyms of FahleiteHide

Other Language Names for FahleiteHide

German:Fahleit
Spanish:Fahleita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Leiteite2 photos of Fahleite associated with Leiteite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.CH.05WalentaiteH(Ca,Mn2+,Fe2+)Fe3+3(AsO4,PO4)4 · 7H2OOrth.
8.CH.10AnapaiteCa2Fe2+(PO4)2 · 4H2OTric. 1 : P1
8.CH.15PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2OTric. 1 : P1
8.CH.20Dittmarite(NH4)Mg(PO4) · H2OOrth.
8.CH.20Niahite(NH4)(Mn2+,Mg)(PO4) · H2OOrth. mm2 : Pmn21
8.CH.25FrancoanelliteK3Al5(PO4)2(HPO4)3 · 12H2OTrig.
8.CH.25Taranakite(K,NH4)Al3(PO4)3(OH) · 9H2OTrig. 3m (3 2/m) : R3c
8.CH.30Schertelite(NH4)2MgH2(PO4)2 · 4H2OOrth.
8.CH.35Hannayite(NH4)2Mg3H4(PO4)4 · 8H2OTric. 1 : P1
8.CH.40Struvite(NH4)Mg(PO4) · 6H2OOrth. mm2
8.CH.40Struvite-(K)KMg(PO4)·6H2OOrth. mm2 : Pmn21
8.CH.40HazeniteKNaMg2(PO4)2 · 14H2OOrth. mm2
8.CH.45Rimkorolgite(Mg,Mn)5(Ba,Sr,Ca)(PO4)4 · 8H2OOrth.
8.CH.50BakhchisaraitseviteNa2Mg5(PO4)4 · 7H2OMon.
8.CH.55SmolyaninoviteCo3Fe3+2(AsO4)4 · 11H2OOrth.
8.CH.60Barahonaite-(Al)(Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x · nH2OMon. 2/m : P2/b
8.CH.60Barahonaite-(Fe)(Ca,Cu,Na,Fe3+,Al)12Fe3+2(AsO4)8(OH,Cl)x · nH2OMon. 2/m : P2/b

Related Minerals - Dana Grouping (8th Ed.)Hide

40.5.8.1SmolyaninoviteCo3Fe3+2(AsO4)4 · 11H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.3.1AdamiteZn2(AsO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnnm
20.3.2ParadamiteZn2(AsO4)(OH)Tric. 1 : P1
20.3.3KoritnigiteZn(HAsO4) · H2OTric. 1 : P1
20.3.4LegranditeZn2(AsO4)(OH) · H2OMon. 2/m : P21/b
20.3.5WarikahniteZn3(AsO4)2 · 2H2OTric.
20.3.6KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
20.3.7StranskiiteZn2Cu(AsO4)2Tric. 1 : P1
20.3.8Philipsburgite(Cu,Zn)6(AsO4,PO4)2(OH)6 · H2OMon.
20.3.9AustiniteCaZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
20.3.10ProsperiteCa2Zn4(AsO4)4 · H2OMon.
20.3.11GaititeCa2Zn(AsO4)2 · 2H2OTric.
20.3.12ZincroseliteCa2Zn(AsO4)2 · 2H2OMon.
20.3.13O'DanieliteNa(Zn,Mg)3H2(AsO4)3Mon. 2/m : B2/b
20.3.14JohilleriteNa(Mg,Zn)3Cu(AsO4)3Mon. 2/m : B2/b
20.3.15Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8Orth. mmm (2/m 2/m 2/m) : Ccca
20.3.16Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
20.3.17Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
20.3.18LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
20.3.19Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)Tric. 1 : P1
20.3.20OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon.
20.3.22KeyiteCu2+3Zn4Cd2(AsO4)6 · 2H2OMon. 2/m

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 FahleiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Medenbach, O., Schmetzer, K., Abraham, K. (1988) Fahleite from Tsumeb/Namibia, a new mineral belonging to the smolianinovite group. Neues Jahrbuch für Mineralogie, Monatshefte: 1988: 167-171.
Jambor, J.L., Puziewicz, J. (1989) New mineral names. American Mineralogist: 74: 500-505.

Internet Links for FahleiteHide

Localities for FahleiteHide

ⓘ - 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.
Namibia (TL)
 
  • Oshikoto Region (Otjikoto Region)
    • Tsumeb
Neues Jahrb.Min.,Mh.(1988) 167-171
Mineral and/or Locality  
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