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Pradetite

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Cap Garonne Mine, Pradet, Var, Provence-Alpes-Côte d'Azur, France
© Brent Thorne 2008

Show Pradetite Photos (2)
Formula:
CoCu
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH)
 
2
·9H
 
2
O
System:TriclinicColour:green
Name:From type locality, Cap Garonne mine, Pradet, Var, France


Lindackerite Group.
Co-analogue of Lindackerite and Veselovskýite.

Classification of Pradetite

IMA status:Approved 1991
Explanation of status:Revalidated in 2006 (IMA 06-D)
Nickel-Strunz 10th (pending) edition ID:8.CE.30

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
Dana 8th edition ID:39.2.6.5

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
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Type Occurrence of Pradetite

Type Locality:Cap Garonne Mine, Pradet, Var, Provence-Alpes-Côte d'Azur, France

Physical Properties of Pradetite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:green
Streak:white
Hardness Data:Could not be measured
Tenacity:Brittle
Cleavage:Perfect
Fracture:Conchoidal
Density (measured):3.33 g/cm3
Density (calculated):3.31 g/cm3

Crystallography of Pradetite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 6.434(5) Å, b = 8.059(5) Å, c = 10.399(8) Å
α = 85.70(6)°, β = 79.14(7)°, γ = 84.87(2)°
Ratio:a:b:c = 0.798 : 1 : 1.29
Unit Cell Volume:V 526.9 ų
Z:1
X-Ray Powder Diffraction:
d-spacingIntensity
10.191 (100)
8.01 (60)
4.001 (50)
3.667 (60)
3.404 (35)
3.258 (30)
3.151 (50)
3.063 (50)
2.674 (40)
Comments:Cap Garonne

Optical Data of Pradetite

Type:Biaxial (+)
RI values: nα = 1.634(2) nβ = 1.662(2) nγ = 1.720(5)
2V:Measured: 75° (4), Calculated: 72°
Maximum Birefringence:δ = 0.086

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v, strong
Pleochroism:Weak
Comments:Z = green, X and Y = colorless

Chemical Properties of Pradetite

Formula:
CoCu
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH)
 
2
·9H
 
2
O
Essential elements:As, Co, Cu, H, O
All elements listed in formula:As, Co, Cu, H, O

Relationship of Pradetite to other Species

Member of Group:
Lindackerite Group:
MCu
 
4
[HAsO
 
4
|AsO
 
4
]
 
2
 · 8-10H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.CE.05Chudobaite
(Mg,Zn)
 
5
[HAsO
 
4
|AsO
 
4
]
 
2
 · 10H
 
2
O
8.CE.05Geigerite
Mn
 
5
[HAsO
 
4
|AsO
 
4
]
 
2
 · 10H
 
2
O
8.CE.10Newberyite
MgHPO
 
4
·3H
 
2
O
8.CE.15Brassite
MgHAsO
 
4
·4H
 
2
O
8.CE.20Phosphorrösslerite
MgHPO
 
4
·7H
 
2
O
8.CE.20Rösslerite
MgHAsO
 
4
·7H
 
2
O
8.CE.25Metaswitzerite
Mn
 
3
(PO
 
4
)
 
2
·4H
 
2
O
8.CE.25Switzerite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
·7H
 
2
O
8.CE.30Lindackerite
CuCu
 
4
[HAsO
 
4
|AsO
 
4
]
 
2
 · 8-9H
 
2
O
8.CE.30IMA2008-010
CaCu
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH)
 
2
·10H
 
2
O
8.CE.30Veselovskýite
ZnCu
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH)
 
2
 · 9H
 
2
O
8.CE.35Bobierrite
Mg
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Annabergite
Ni
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Arupite
Ni
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Erythrite
Co
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Ferrisymplesite
Fe
3+
3
[(OH)
 
3
|(AsO
 
4
)
 
2
] · 5H
 
2
O
8.CE.40Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Köttigite
Zn
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Vivianite
Fe
2+
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Pakhomovskyite
Co
 
3
[PO
 
4
]
 
2
 · 8H
 
2
O
8.CE.45Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.50Cattiite
Mg
 
3
(PO
 
4
)
 
2
·22H
 
2
O
8.CE.55Koninckite
Fe
3+
 
[PO
 
4
] · 3H
 
2
O
8.CE.60Kaňkite
FeAsO
 
4
·3.5H
 
2
O
8.CE.65Steigerite
AlVO
 
4
·3H
 
2
O
8.CE.70Metaschoderite
Al
 
2
(PO
 
4
)(VO
 
4
)·6H
 
2
O
8.CE.70Schoderite
Al
 
2
(PO
 
4
)(VO
 
4
)·8H
 
2
O
8.CE.75Malhmoodite
FeZr(PO
 
4
)
 
2
·4H
 
2
O
8.CE.75Zigrasite
MgZr(PO
 
4
)
 
2
·4H
 
2
O
8.CE.75Unnamed (Ca-analogue of Zigrasite)
CaZr[PO
 
4
]
 
2
·4H
 
2
O
8.CE.80Santabarbaraite
Fe
3+
3
[(OH)
 
3
|(PO
 
4
)
 
2
] · 5H
 
2
O
8.CE.85Metaköttigite
(Zn,Fe,Fe)
 
3
(AsO
 
4
)
 
2
·8(H
 
2
O,OH)
8.CE.85Metavivianite
Fe
2+
3-x
Fe
3+
x
(PO
 
4
)
 
2
(OH)x·(8-x)H
 
2
O

Other Names for Pradetite

Synonyms:
IMA1991-046
Other Languages:

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 Pradetite

Reference List:H. Sarp & B. Dominik (1995): Redefinition de la Lindackerite: sa formule chimique, ses donnees cristallographiques et optiques. Archs Sci. Geneve 48, 239-250.

Hybler, J., et al. (2003) European Journal of Mineralogy: 15: 1035-1042.

American Mineralogist (2004): 89: 1833 (abstract).

Burke, E. AJ, J. Sejkora, H. Sarp & P-J. Chiappero (2007): Revalidation of pradetite as a mineral. Archives des Sciences- Geneve 60, 51-54.

Internet Links for Pradetite

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    Localities for Pradetite

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