Pradetite
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About Pradetite

Mineralized pillar in the museum
Cap Garonne Mine, Le Pradet, Var, Provence-Alpes-Côte d'Azur, France
Cap Garonne Mine, Le Pradet, Var, Provence-Alpes-Côte d'Azur, France
Formula:
CoCu4(AsO4)2(HAsO4)2 · 9H2O
Colour:
green
Lustre:
Vitreous
Specific Gravity:
3.33
Crystal System:
Triclinic
Member of:
Name:
From type locality, Cap Garonne mine, Pradet, Var, France
Classification of Pradetite
Approved
Approval Year:
1991
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
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
39.2.6.5
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
Physical Properties of Pradetite
Vitreous
Transparency:
Transparent
Colour:
green
Streak:
white
Hardness Data:
Could not be measured
Tenacity:
Brittle
Cleavage:
Perfect
Fracture:
Conchoidal
Density:
3.33 g/cm3 (Measured) 3.31 g/cm3 (Calculated)
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°
Max Birefringence:
δ = 0.086

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
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:
CoCu4(AsO4)2(HAsO4)2 · 9H2O
IMA Formula:
CoCu4(AsO4)2(AsO3OH)2 · 9H2O
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)°
α = 85.70(6)°, β = 79.14(7)°, γ = 84.87(2)°
Ratio:
a:b:c = 0.798 : 1 : 1.29
Unit Cell V:
526.9 ų
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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) |
2.615 | (35) |
Comments:
Cap Garonne
Type Occurrence of Pradetite
Synonyms of Pradetite
Relationship of Pradetite to other Species
Member of:
Other Members of this group:
Hloušekite | (Ni,Co)Cu4(AsO4)2(AsO3OH)2·9H2O | Tric. 1 : P1 |
Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
Related Minerals - Nickel-Strunz Grouping
8.CE.X | Babánekite | Cu3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.05 | Chudobaite | (Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O | Tric. |
8.CE.05 | Geigerite | Mn2+5(AsO4)2(HAsO4)2 · 10H2O | Tric. |
8.CE.10 | Newberyite | Mg(HPO4) · 3H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
8.CE.15 | Brassite | Mg(HAsO4) · 4H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
8.CE.20 | Phosphorrösslerite | Mg(HPO4) · 7H2O | Mon. 2/m : P2/b |
8.CE.20 | Rößlerite | Mg(HAsO4) · 7H2O | Mon. 2/m : B2/b |
8.CE.25 | Metaswitzerite | Mn2+3(PO4)2 · 4H2O | Mon. 2/m : P2/b |
8.CE.25 | Switzerite | (Mn,Fe)3(PO4)2 · 7H2O | Mon. |
8.CE.30 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
8.CE.30 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O | Tric. 1 : P1 |
8.CE.30 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
8.CE.30 | Klajite | MnCu4(AsO4)2(HAsO4)2 · 9-10H2O | Tric. 1 : P1 |
8.CE.35 | Bobierrite | Mg3(PO4)2 · 8H2O | Mon. 2/m : B2/b |
8.CE.40 | Annabergite | Ni3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Arupite | Ni3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Barićite | (Mg,Fe)3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Erythrite | Co3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Ferrisymplesite | Fe3+3(AsO4)2(OH)3 · 5H2O | |
8.CE.40 | Hörnesite | Mg3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Köttigite | Zn3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Manganohörnesite | (Mn,Mg)3(AsO4)2 · 8H2O | Mon. 2/m : P2/m |
8.CE.40 | Parasymplesite | Fe2+3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Vivianite | Fe2+3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.40 | Pakhomovskyite | Co3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
8.CE.45 | Symplesite | Fe2+3(AsO4)2 · 8H2O | Tric. 1 : P1 |
8.CE.50 | Cattiite | Mg3(PO4)2 · 22H2O | Tric. 1 : P1 |
8.CE.55 | Koninckite | Fe3+PO4 · 3H2O | Tet. |
8.CE.60 | Kaňkite | FeAsO4 · 3.5H2O | Mon. |
8.CE.65 | Steigerite | Al(VO4) · 3H2O | Mon. 2/m : P21/m |
8.CE.70 | Metaschoderite | Al2(PO4)(VO4) · 6H2O | Mon. 2/m : P2/m |
8.CE.70 | Schoderite | Al2(PO4)(VO4) · 8H2O | Mon. |
8.CE.75 | Malhmoodite | FeZr(PO4)2 · 4H2O | Mon. |
8.CE.75 | Zigrasite | MgZr(PO4)2 · 4H2O | Tric. 1 : P1 |
8.CE.75 | Unnamed (Ca-analogue of Zigrasite) | CaZr[PO4]2 · 4H2O | Tric. |
8.CE.80 | Santabarbaraite | Fe3+3(PO4)2(OH)3 · 5H2O | Amor. |
8.CE.85 | Metaköttigite | (Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH) | Tric. 1 : P1 |
Related Minerals - Dana Grouping (8th Ed.)
39.2.6.1 | Chudobaite | (Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O | Tric. |
39.2.6.1 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
39.2.6.2 | Geigerite | Mn2+5(AsO4)2(HAsO4)2 · 10H2O | Tric. |
39.2.6.4 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O | Tric. 1 : P1 |
39.2.6.6 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O | Tric. 1 : P1 |
Other Information
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 Pradetite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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
mindat.org URL:
https://www.mindat.org/min-30767.html
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Please feel free to link to this page.
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Localities for Pradetite
Locality List




All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Pavel Škácha |
France (TL) | |
| H.Sarp & B.Dominik (1995): Archs Sci. Geneve,48,239-250. |
Germany | |
| Slotta, C. (2016): Von Carlhintzeit bis Pradeit: Neue Mineralfunde aus dem Schwarzwald. Lapis 41 (2), 30-31. (in German) |
Anton Mine, Heubach Valley, Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany