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Plumboagardite

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Big Photo

Niederschlag, Bärenstein, Niederschlag-Bärenstein District, Erzgebirge, Saxony, Germany
© Brent Thorne 2009




Formula:
(Pb,REE,Ca)Cu
 
6
(AsO
 
4
)
 
2
(HAsO
 
4
,AsO
 
4
)(OH)
 
6
 · 3H
 
2
O
System:HexagonalColour:green
Hardness:3
Name:Named as the lead (latin plumbum) analogue of agardite.
This page provides mineralogical data about Plumboagardite.

Classification of Plumboagardite

IMA status:Approved 2003
Strunz 8th edition ID:7/D.53-85
Nickel-Strunz 10th (pending) edition ID: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
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Type Occurrence of Plumboagardite

Type Locality:Aitern South Mine, Aitern, Schönau, Black Forest, Baden-Württemberg, Germany
General Appearance of Type Material:spherulitic aggregates of radial fibrous structure, composed of acicular crystals elongated on [0001] and reaching 0.05 mm in length
Associated Minerals at type locality:
QuartzLimoniteFluoriteChrysocolla

Physical Properties of Plumboagardite

Lustre:Vitreous
Colour:green
Streak:greenish
Hardness (Mohs):3
Cleavage:None Observed
Density (calculated):3.741 g/cm3

Crystallography of Plumboagardite

Crystal System:Hexagonal
Class (H-M):6/m - Dipyramidal
Space Group:P63/m
Cell Parameters:a = 13.77Å, c = 5.94Å
Ratio:a:c = 1 : 0.431
Unit Cell Volume:V 975.40 ų (Calculated from Unit Cell)
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
12.01 (10)
4.51 (6)
3.60 (8)
2.98 (6)
2.49 (7)

Optical Data of Plumboagardite

Type:Uniaxial (+)
RI values: nω = 1.726 nε = 1.805
Maximum Birefringence:δ = 0.079

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Plumboagardite

Formula:
(Pb,REE,Ca)Cu
 
6
(AsO
 
4
)
 
2
(HAsO
 
4
,AsO
 
4
)(OH)
 
6
 · 3H
 
2
O
Essential elements:As, Cu, H, O, Pb
All elements listed in formula:As, Ca, Cu, H, O, Pb
Analytical Data:water by difference to 100%, empirical formula based on 6 hydroxide ions and 12 additional oxygen atoms
PbO (8.99)
La2O3 (1.91)
Nd2O3 (1.17)
Ce2O3 (0.96)
Sm2O3 (0.20)
Pr2O3 (0.19)
Gd2O3 (0.17)
Dy2O3 (0.10)
Y2O3 (0.96)
CaO (1.44)
CuO (40.49)
Fe2O3 (1.54)
As2O5 (29.74)
P2O5 (0.30)
SiO2 (1.46)
H2O (10.38)
Empirical Formula:
(Pb
 
0.44
REE
 
0.40
Ca
 
0.28
)(Cu
 
5.59
Fe
 
0.21
)(As
 
2.84
Si
 
0.27
P
 
0.05
)O
 
12
(OH)
 
6
 · 3.33H
 
2
O
Common Impurities:Fe,P,Si

Relationship of Plumboagardite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DL.05Foggite
CaAl(PO
 
4
)(OH)
 
2
 · H
 
2
O
8.DL.10Cyrilovite
NaFe
3+
3
(PO
 
4
)
 
2
(OH)
 
2
 · 2H
 
2
O
8.DL.10Millisite
(Na,K)CaAl
 
6
(PO
 
4
)
 
4
(OH)
 
9
 · 3H
 
2
O
8.DL.10Wardite
NaAl
 
3
(PO
 
4
)
 
2
(OH)
 
4
 · 2H
 
2
O
8.DL.15Agardite-(Nd)
NdCu
 
6
(AsO
 
4
)
 
3
(OH)
 
6
 · 3H
 
2
O
8.DL.15Agardite-(Y)
(Y,Ca)Cu
 
6
(AsO
 
4
)
 
2
(AsO
 
4
,HAsO
 
4
)(OH)
 
6
 · 3H
 
2
O
8.DL.15Agardite-(Ce)
CeCu
 
6
(AsO
 
4
)
 
3
(OH)
 
6
 · 3H
 
2
O
8.DL.15Agardite-(La)
(La,Ce)Cu
 
6
(AsO
 
4
)
 
3
(OH)
 
6
 · 3H
 
2
O
8.DL.15Goudeyite
(Al,Y)Cu
 
6
(AsO
 
4
)
 
3
(OH)
 
6
 · 3H
 
2
O
8.DL.15Mixite
BiCu
 
6
(AsO
 
4
)
 
3
(OH)
 
6
 · 3H
 
2
O
8.DL.15Petersite-(Y)
(Y,Ce,Nd)Cu
 
6
(PO
 
4
)
 
3
(OH)
 
6
 · 3H
 
2
O
8.DL.15Zálesíite
(Ca,Y)Cu
 
6
(AsO
 
4
)
 
2
(HAsO
 
4
,AsO
 
4
)(OH)
 
6
 · 3H
 
2
O
8.DL.15Calciopetersite
CaCu
 
6
(PO
 
4
)
 
2
(HPO
 
4
)(OH)
 
6
 · 3H
 
2
O
8.DL.20Cheremnykhite
Pb
 
3
Zn
 
3
(VO
 
4
)
 
2
(TeO
 
6
)
8.DL.20Dugganite
Pb
 
3
Zn
 
3
(AsO
 
4
)
 
2
(TeO
 
6
)
8.DL.20Kuksite
Pb
 
3
Zn
 
3
(PO
 
4
)
 
2
(TeO
 
6
)
8.DL.20Wallkilldellite-(Mn)
Ca
 
2
Mn
2+
3
(AsO
 
4
)
 
2
(OH)
 
4
 · 9H
 
2
O
8.DL.20Wallkilldellite-(Fe)
(Ca,Cu)
 
4
Fe
2+
6
(AsO
 
4
,SiO
 
4
)
 
4
(OH,O)
 
8
 · 18H
 
2
O
8.DL.25Angastonite
CaMgAl
 
2
(PO
 
4
)
 
2
(OH)
 
4
 · 7H
 
2
O

Other Names for Plumboagardite

Synonyms:
IMA2003-031a
Other Languages:
German:Plumboagardit

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Plumboagardite

Reference List:

- +
Walenta, K., Th. Theye (2005), Plumboagardite, a new mineral of the mixite group from an occurrence in the Southern Black Forest, Germany: Neues Jahrbuch für Mineralogie, Abhandlungen: 181: 219-224.

Internet Links for Plumboagardite

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  • Raman and XRD data at RRUFF project[Link Broken?]
  • American Mineralogist Crystal Structure Database[Link Broken?]
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    • Localities for Plumboagardite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Schönau
          • Aitern
    		K. Walenta, Th. Theye: N. Jb. Min. Abhl. 181:219-224 (2005)
    • Saxony
      • Erzgebirge
        • Niederschlag-Bärenstein District
          • Bärenstein
    		Analyzed by EDX and XRD by Excalibur Minerals
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