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⇱ Agardite-(Nd): Mineral information, data and localities.

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Agardite-(Nd)

A valid IMA mineral species
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About Agardite-(Nd)Hide

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Formula:
NdCu6(AsO4)3(OH)6 · 3H2O
Colour:
Grass-green, greenish, greenish-blue
Lustre:
Vitreous, Silky
Hardness:
3 - 4
Crystal System:
Hexagonal
Member of:
Originally an incompletely characterised member of the Mixite Group, published without approval.

Finally approved in 2010, based on material from the Hilarion Mine, Lavrion, Greece.

Quantitative analyses are generally needed to ensure that the Mixite-group sample in question is really Nd-dominant, and not simply a Nd-rich variety.

Originally reported from Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany.


Unique IdentifiersHide

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Mindat ID:
43
Long-form identifier:
mindat:1:1:43:3

Similar NamesHide

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AgarditeA synonym
Agardite-(Ca)A synonym of ZálesíiteCaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O
Agardite-(Ce)A valid IMA mineral speciesCeCu6(AsO4)3(OH)6 · 3H2O
Agardite-(Dy)(Dy,La)Cu6(AsO4)3(OH)6 · 3H2O
Agardite-(La)A valid IMA mineral speciesLaCu6(AsO4)3(OH)6 · 3H2O
Agardite-(Y)A valid IMA mineral speciesYCu6(AsO4)3(OH)6 · 3H2O

IMA Classification of Agardite-(Nd)Hide

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Approved
IMA Formula:
NdCu2+6(AsO4)3(OH)6 · 3H2O
Approval year:
2010
First published:
2011

Classification of Agardite-(Nd)Hide

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8.DL.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1

Mineral SymbolsHide

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

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

Physical Properties of Agardite-(Nd)Hide

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Vitreous, Silky
Transparency:
Transparent
Comment:
Vitreous in crystals and silky in aggregates.
Colour:
Grass-green, greenish, greenish-blue
Streak:
White, greenish white
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Comment:
Density could not be measured.

Optical Data of Agardite-(Nd)Hide

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Type:
Uniaxial (+)
RI values:
nω = 1.709 - 1.712 nε = 1.775 - 1.780
Max. Birefringence:
δ = 0.066 - 0.068
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.

Surface Relief:
Moderate
Pleochroism:
Strong
Comments:
O = pale turquoise; E = bright green-blue.
Comments:
Absorption: E > O.

Chemistry of Agardite-(Nd)Hide

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Mindat Formula:
NdCu6(AsO4)3(OH)6 · 3H2O
Element Weights:
Element% weight
Cu34.713 %
O30.590 %
As20.464 %
Nd13.132 %
H1.101 %

Calculated from ideal end-member formula.

Crystallography of Agardite-(Nd)Hide

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Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Cell Parameters:
a = 13.548(8) Å, c = 5.894(6) Å
Ratio:
a:c = 1 : 0.435
Unit Cell V:
936.90 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
11.70 Å(100)
4.443 Å(22)
3.545 Å(18)
3.255 Å(8)
2.935 Å(18)
2.695 Å(13)
2.559 Å(10)
2.453 Å(30)
Comments:
Hilarion Mine, Kamariza Mines, Attica, Greece. The data are from Pekov et al. (2011).

Geological EnvironmentHide

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Paragenetic Mode(s):

Type Occurrence of Agardite-(Nd)Hide

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General Appearance of Type Material:
Thin, acicular to hair-like crystals up to 0.5 mm long and up to 5 μm thick, elongate along [001], with a hexagonal cross section. Also occurs with agardite-(Y) and/or agardite-(La) to form rims, up to 3 μm thick, in zoned acicular crystals, up to 0.015 × 1.2 mm, with a core of zálesíite. Typically in sprays or radiating clusters up to 2 mm.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of Russian Academy of Sciences, Moscow, Russia, number 4020/1.
Geological Setting of Type Material:
In cavities of an oxidized ore (primarily goethite) and in cracks of supergene altered mica schist.
Associated Minerals at Type Locality:

Synonyms of Agardite-(Nd)Hide

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Other Language Names for Agardite-(Nd)Hide

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Norwegian:Agarditt-(Nd)
Simplified Chinese:砷钕铜石
Traditional Chinese:砷釹銅石

Relationship of Agardite-(Nd) to other SpeciesHide

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Member of:
Other Members of Mixite Group:
Agardite-(Ce)CeCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
CalciopetersiteCaCu6(PO4)2(PO3OH)(OH)6 · 3H2OHex. 6/m : P63/m
GoudeyiteAlCu6(AsO4)3(OH)6 · 3H2OHex.
MixiteBiCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
Petersite-(Ce)CeCu6(PO4)3(OH)6 · 3H2OHex. 6/m : P63/m
Petersite-(La)LaCu6(PO4)3(OH)6 · 3H2OHex. 6/m : P63/m
Petersite-(Y)YCu6(PO4)3(OH)6 · 3H2OHex.
PlumboagarditePbCu6(AsO4)2(AsO3OH)(OH)6 · 3H2OHex. 6/m : P63/m
ZálesíiteCaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2OHex. 6/m : P63/m

Common AssociatesHide

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Associations Based on Photo Data:
16 photos of Agardite-(Nd) associated with ConichalciteCaCu(AsO4)(OH)
3 photos of Agardite-(Nd) associated with AdamiteZn2(AsO4)(OH)
2 photos of Agardite-(Nd) associated with BrochantiteCu4(SO4)(OH)6
2 photos of Agardite-(Nd) associated with MalachiteCu2(CO3)(OH)2
1 photo of Agardite-(Nd) associated with PseudomalachiteCu5(PO4)2(OH)4
1 photo of Agardite-(Nd) associated with 'Chalcedony'SiO2
1 photo of Agardite-(Nd) associated with Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
1 photo of Agardite-(Nd) associated with LibetheniteCu2(PO4)(OH)
1 photo of Agardite-(Nd) associated with 'Copper-bearing Adamite'(Zn,Cu)2AsO4OH
1 photo of Agardite-(Nd) associated with Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2O

Related Minerals - Strunz-mindat GroupingHide

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8.DL.05FoggiteCaAl(PO4)(OH)2 · H2OOrth. mmm(2/m2/m2/m)
8.DL.10FluorowarditeNaAl3(PO4)2F2(OH)2(H2O)2 Tet. 422 : P41212
8.DL.10WarditeNaAl3(PO4)2(OH)4 · 2H2OTet. 422 : P41212
8.DL.10Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2OTet.
8.DL.10CyriloviteNaFe3+3(PO4)2(OH)4 · 2H2OTet. 422 : P41212
8.DL.15Petersite-(Ce)CeCu6(PO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15Agardite-(Ce)CeCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15'Agardite-(Dy)'(Dy,La)Cu6(AsO4)3(OH)6 · 3H2OHex.
8.DL.15Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15Petersite-(Y)YCu6(PO4)3(OH)6 · 3H2OHex.
8.DL.15ZálesíiteCaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15MixiteBiCu6(AsO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15Petersite-(La)LaCu6(PO4)3(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15GoudeyiteAlCu6(AsO4)3(OH)6 · 3H2OHex.
8.DL.15CalciopetersiteCaCu6(PO4)2(PO3OH)(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.15PlumboagarditePbCu6(AsO4)2(AsO3OH)(OH)6 · 3H2OHex. 6/m : P63/m
8.DL.20DugganitePb3Zn3(AsO4)2(TeO6)Trig. 32 : P321
8.DL.20WallkilldelliteCa2Mn2+3(AsO4)2(OH)4 · 9H2OHex.
8.DL.20Wallkilldellite-(Fe)(Ca,Cu)4Fe2+6(AsO4,SiO4)4(OH,O)8 · 18H2OHex.
8.DL.20CheremnykhitePb3Zn3(VO4)2(TeO6)Orth.
8.DL.20KuksitePb3Zn3(PO4)2(TeO6)Trig. 32 : P321
8.DL.25AngastoniteCaMgAl2(PO4)2(OH)4 · 7H2OAmor.
8.DL.30LångbanshyttanitePb2Mn2Mg(AsO4)2(OH)4 · 6H2OTric. 1 : P1

Fluorescence of Agardite-(Nd)Hide

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Not fluorescent.

Other InformationHide

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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 Agardite-(Nd)Hide

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mindat.org URL:
https://www.mindat.org/min-43.html
Please feel free to link to this page.

References for Agardite-(Nd)Hide

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Localities for Agardite-(Nd)Hide

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Showing 24 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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.
Australia
  • New South Wales
    • Robinson Co.
      • Cobar
Leverett et al. (2003)
  • Western Australia
    • East Pilbara Shire
      • Rudall River District
Downes et al. (2006)
Austria
  • Salzburg
    • St. Johann im Pongau District
      • Bad Gastein
        • Naßfeld valley
          • Kreuzkogel massif
            • Radhausberg
Kolitsch (2014)
  • Styria
    • Leoben District
      • Sankt Stefan ob Leoben
        • Kaisersberg
Auer (2025)
    • Weiz District
      • Rettenegg
        • Prinzkogel (Prinzenkogel)
          • Prinzkogel mines
            • Southern District
Exel (1993) +1 other reference
Bulgaria
  • Sofia Province
    • Svoge Municipality
      • Osenovlag
Kunov +2 other references
France
  • Auvergne-Rhône-Alpes
    • Rhône
      • Villefranche-sur-Saône
        • Chessy
Germany
  • Baden-Württemberg
    • Freiburg Region
      • Ortenaukreis
        • Gengenbach
          • Gengenbach
[Wittern (1995) +1 other reference
        • Oberwolfach
Göb et al. (2011)
      • Rottweil
        • Schenkenzell
          • Wittichen
            • Burgfelsen
Walenta et al. (2004)
Walenta (1992)
Walenta (1992)
      • Waldshut
        • Dachsberg
          • Urberg
Walenta (1992)
    • Karlsruhe Region
      • Freudenstadt
        • Bad Rippoldsau-Schapbach
Walenta (1992)
      • Pforzheim
        • Würm
Walenta (1992) +1 other reference
Greece (TL)
  • Attica
    • East Attica
      • Lavreotiki
        • Agios Konstantinos (Kamariza)
          • Kamariza Mines (Kamareza Mines)
Williams et al. (2011) +1 other reference
Italy
  • Liguria
    • Savona Province
      • Bardineto
Collected by F. Castellaro and probed ...
  • Lombardy
    • Varese Province
Guastoni et al. (2017)
        • Cavagnano
Guastoni et al. (2017)
Guastoni et al. (2017)
UK
  • England
    • Cornwall
      • Hayle
        • Great Wheal Alfred (Alfred Consols)
Embrey (1978) +1 other reference
USA
  • Nevada
    • Esmeralda County
      • Railroad Springs Mining District
Castor et al. (2004)
Dakota Matrix - Tom Loomis
    • Mineral County
      • Bell Mining District
Castor et al. (2004)
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