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Bendadaite

A valid IMA mineral species
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06799320017272471294660.jpg
Bendadaite

Almerindo claim, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil
06029890017671027948974.jpg
Bendadaite

Oumlil, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
09680770017272471293620.jpg
Bendadaite, etc.

Esperanza Mine, Kaminiza mines, Km 3, Lavreotiki, East Attica, Attica, Greece
06799320017272471294660.jpg
Bendadaite

Almerindo claim, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil
03138700017640790508272.jpg
Bendadaite

Oumlil, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
09680770017272471293620.jpg
Bendadaite, etc.

Esperanza Mine, Kaminiza mines, Km 3, Lavreotiki, East Attica, Attica, Greece
05873890017272471309495.jpg
Bendadaite

Almerindo claim, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil
06029890017671027948974.jpg
Bendadaite

Oumlil, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
Hide all sections | Show all sections

About BendadaiteHide

07389850017272471309907.jpg
A view of the locality

Bendada Mines, Bendada, Sabugal, Guarda, Portugal
Formula:
Fe2+Fe3+2(AsO4)2(OH)2 · 4H2O
Colour:
Blackish green to dark brownish
Lustre:
Sub-Adamantine, Vitreous
Hardness:
3
Specific Gravity:
3.15
Crystal System:
Monoclinic
Member of:
Arthurite Group
Name:
Named after the type locality, the Bendada phosphate pegmatite, Bendada Quarries, Sabugal, Guarda District, Portugal.
Isostructural with:
Whitmoreite
Arthurite Group. The arsenate analogue of Whitmoreite.

The divalent Fe may be partly oxidised.

Chemically related to césarferreiraite.


Unique IdentifiersHide

Mindat ID:
31722
Long-form identifier:
mindat:1:1:31722:5

IMA Classification of BendadaiteHide

Classification of BendadaiteHide

Strunz-mindat (2026):
8.DC.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
Dana 8th ed.:
42.11.20.6

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
BddIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of BendadaiteHide

Lustre:
Sub-Adamantine, Vitreous
Transparency:
Translucent
Colour:
Blackish green to dark brownish
Streak:
Greenish yellow
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
parallel to {010}
Fracture:
Irregular/Uneven
Density:
3.15(10) g/cm3 (Measured)    3.193 g/cm3 (Calculated)

Optical Data of BendadaiteHide

Type:
Biaxial (+)
RI values:
nα = 1.734(3) nβ = 1.759(3) nγ = 1.787(4)
2V:
Measured: 85° (4), Calculated: 88°
Max. Birefringence:
δ = 0.053
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Optical Extinction:
Optical axis plane is parallel to (010); X ≈ a; Z ≈ c.
Pleochroism:
Strong
Comments:
X = pale reddish brown; Y = yellowish brown; Z = dark yellowish brown.
Comments:
Absorption: Z > Y > X.

Chemistry of BendadaiteHide

Mindat Formula:
Fe2+Fe3+2(AsO4)2(OH)2 · 4H2O
Element Weights:
Element% weight
O40.619 %
Fe30.381 %
As27.173 %
H1.828 %

Calculated from ideal end-member formula.
O
Fe
As
H
Elements listed:
As, Fe, H, O - search for minerals with similar chemistry

Crystallography of BendadaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 10.239 Å, b = 9.713 Å, c = 5.552 Å
β = 94.11°
Ratio:
a:b:c = 1.054 : 1 : 0.572
Unit Cell V:
550.73 ų (Calculated from Unit Cell)
Z:
2
Twinning:
None

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.22 Å(100)
7.036 Å(80)
4.833 Å(30)
4.520 Å(50)
3.490 Å(20)
2.907 Å(30)
2.865 Å(40)
Comments:
Bendada Mines, Guarda, Portugal. The data are from the type description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47d : [Arsenates, antimonates, selenates, bismuthinates]

Type Occurrence of BendadaiteHide

Co-Type Localities:
ⓘ Almerindo claim, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil
ⓘ Bendada Mines, Bendada, Sabugal, Guarda, Portugal
General Appearance of Type Material:
Tufts (<0.1 mm long) and flattened radiating aggregates.
Place of Conservation of Type Material:
Natural History Museum, Vienna, Austria (catalogue number N 8160). The co-type material has been deposited in the Museu de Geociências, Instituto de Geociências, Universidade de São Paulo, Brazil (catalogue number DR625).
Geological Setting of Type Material:
Pegmatite
Associated Minerals at Type Locality:
MansfielditeScorodite
Reference:
Kolitsch, U., Atencio, D., Chukanov, N. V., Zubkova, N. V., Menezes Filho, L. A. D., Coutinho, J. M. V., Birch, W. D., Schlüter, J., Pohl, D., Kampf, A. R., Steele, I. M., Favreau, G., Nasdala, L., Möckel, S., Giester, G., Pushcharovsky, D. Yu. (2010) Bendadaite, a new iron arsenate mineral of the arthurite group. Mineralogical Magazine, 74 (3) 469-486 doi:10.1180/minmag.2010.074.3.469

Synonyms of BendadaiteHide

Other Language Names for BendadaiteHide

German:Bendadait

Relationship of Bendadaite to other SpeciesHide

Member of:
Arthurite Group
Other Members of Arthurite Group:
ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
CobaltarthuriteCoFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
'UKI-2006-(PO:AlCuFeH)'Fe2+Al3+2(PO4)2(OH)2 · 4H2O
'UM2006-27-PO:FeHZn'ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b

Common AssociatesHide

Associations Based on Photo Data:
5 photos of Bendadaite associated with ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2O
3 photos of Bendadaite associated with ArsenopyriteFeAsS
3 photos of Bendadaite associated with HydroxylherderiteCaBe(PO4)(OH)
3 photos of Bendadaite associated with GoyaziteSrAl3(PO4)(PO3OH)(OH)6
3 photos of Bendadaite associated with OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2O
2 photos of Bendadaite associated with ScoroditeFe3+AsO4 · 2H2O
2 photos of Bendadaite associated with LöllingiteFeAs2
1 photo of Bendadaite associated with 'Mansfieldite-Scorodite Series'
1 photo of Bendadaite associated with LudlockitePbFe3+4As3+10O22
1 photo of Bendadaite associated with KaribibiteFe3+3(As3+O2)4(As3+2O5)(OH)

Related Minerals - Strunz-mindat GroupingHide

8.DC.FerroberauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.CésarferreiraiteFe2+ Fe3+2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.FerrivauxiteFe3+Al2(PO4)2(OH)3 · 5H2OTric. 1 : P1
8.DC.IanbruceiteZn2(AsO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon. 2/m : B2/b
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2OOrth. 222 : P212121
8.DC.10LegranditeZn2(AsO4)(OH) · H2OMon. 2/m : P21/b
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15'UM2006-27-PO:FeHZn'ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15'UKI-2006-(PO:AlCuFeH)'Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.15CobaltarthuriteCoFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
8.DC.20MagnesiobermaniteMgMn3+2(PO4)2(OH)2 · 4H2OMon. 2 : P21
8.DC.20BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
8.DC.20CoralloiteMn2+Mn3+2(AsO4)2(OH)2 · 4H2OTric. 1 : P1
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.25ZincostrunziteZnFe3+2(PO4)2(OH)2 · 6.5H2OTric. 1 : P1
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.25MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
8.DC.27BerauniteFe3+6(PO4)4O(OH)4 · 6H2OMon. m : Bb
8.DC.27TvrdýiteFe2+Fe3+2Al3(PO4)4(OH)5(H2O)4 · 2H2OMon. 2/m : B2/b
8.DC.27ZincoberauniteZnFe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric. 1 : P1
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2OTric. 1 : P1
8.DC.30Kayrobertsonite[MnAl2(PO4)2(OH)2(H2O)4] · 2H2OTric. 1 : P1
8.DC.30KummeriteMn2+Fe3+Al(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.32KamarizaiteFe3+3(AsO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.32TinticiteFe3+3(PO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24AlO6(PO4)17(OH)12 · 75H2OHex. 6/m : P63/m
8.DC.45SouzaliteMg3Al4(PO4)4(OH)6 · 2H2OTric. 1
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2OTric.
8.DC.50AllanpringiteFe3+3(PO4)2(OH)3 · 5H2OMon. 2/m : P21/m
8.DC.50FluorwavelliteAl3(PO4)2(OH)2F · 5H2OOrth. mmm(2/m2/m2/m)
8.DC.50WavelliteAl3(PO4)2(OH)3 · 5H2OOrth. mmm(2/m2/m2/m)
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon. m : Bm
8.DC.57OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm(2/m2/m2/m) : Cmmm
8.DC.60CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2OMon. 2/m : P21/b
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2OOrth. mmm(2/m2/m2/m)
8.DC.62KenngottiteMn2+3Fe3+4(PO4)4(OH)6(H2O)2 Mon. 2/m : P2/b
8.DC.67MolinelloiteCu(H2O)(OH)V4+O(V5+O4)Tric. 1 : P1
8.DC.70WhitecapsiteH16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2OHex. 6/m : P63/m
8.DC.75HeimitePbCu2(AsO4)(OH)3 · 2H2OMon. 2/m
8.DC.80LedneviteCu[PO3(OH)] · H2OMon. 2/m : P21/b

Fluorescence of BendadaiteHide

Other InformationHide

Notes:
Bendadaite dissolves in hot dilute HCl or HNO3 but not in cold acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for BendadaiteHide

References for BendadaiteHide

Localities for BendadaiteHide

Showing 16 localities.

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.
Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Brazil (TL)
 
  • Minas Gerais
    • Divino das Laranjeiras
      • Linópolis
Kolitsch et al. (2010)
Chile
 
  • Atacama
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga mining district
Kolitsch et al. (2010)
Czech Republic
 
  • Karlovy Vary Region
    • Sokolov District
      • Krásno
Sejkora et al. (2019)
France
 
  • Nouvelle-Aquitaine
    • Haute-Vienne
      • Bellac
        • Razès
          • Chanteloube
            • Vilatte Quarries (La Vilate)
Meisser (2010)
        • Vaulry
Queneau (n.d.)
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Agios Konstantinos (Kamariza)
          • Mercati mines
Rieck et al. (2018)
        • Km 3
          • Kaminiza mines
Rieck et al. (2018)
no description given yet] +1 other reference
Italy
 
  • Sardinia
    • South Sardinia Province
      • Gonnosfanadiga
        • Fenugu Sibiri Mine
Kolitsch et al. (2010) +1 other reference
Japan
 
  • Oita Prefecture
    • Saiki City
Satoshi Matsubara et al. (2009)
OHNISHI et al. (2013) +1 other reference
Morocco
 
  • Drâa-Tafilalet Region
    • Zagora Province
      • Agdz Cercle
        • Tansifte Caïdat
          • Oumlil
Kolitsch et al. (2010)
Namibia
 
  • Oshikoto Region
    • Tsumeb
Veldsman et al. (04/21) +1 other reference
Portugal (TL)
 
  • Guarda
    • Sabugal
      • Bendada
Kolitsch et al. (2010)
Spain
 
  • Galicia
    • Pontevedra
      • O Rosal
        • San Miguel de Tabagón
Calvo Rebollar (2015)
USA
 
  • New Hampshire
    • Cheshire County
      • Marlow
Czaja (2025)
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