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Pradetite

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About PradetiteHide

Formula:
CoCu4(AsO4)2(HAsO4)2 · 9H2O
Colour:
green
Lustre:
Vitreous
Specific Gravity:
3.33
Crystal System:
Triclinic
Name:
From type locality, Cap Garonne mine, Pradet, Var, France

Classification of PradetiteHide

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
39.2.6.5

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

Physical Properties of PradetiteHide

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 PradetiteHide

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.
Surface Relief:
Moderate
Dispersion:
r < v, strong
Pleochroism:
Weak
Comments:
Z = green, X and Y = colorless

Chemical Properties of PradetiteHide

Formula:
CoCu4(AsO4)2(HAsO4)2 · 9H2O
IMA Formula:
CoCu4(AsO4)2(AsO3OH)2 · 9H2O

Crystallography of PradetiteHide

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 V:
526.9 ų
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
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)
2.615 (35)
Comments:
Cap Garonne

Type Occurrence of PradetiteHide

Synonyms of PradetiteHide

Relationship of Pradetite to other SpeciesHide

Other Members of this group:
Hloušekite(Ni,Co)Cu4(AsO4)2(AsO3OH)2·9H2OTric. 1 : P1
LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1

Related Minerals - Nickel-Strunz GroupingHide

8.CE.XBabánekiteCu3(AsO4)2 · 8H2O Mon. 2/m : B2/m
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.05GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.10NewberyiteMg(HPO4) · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.15BrassiteMg(HAsO4) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2OMon. 2/m : P2/b
8.CE.20RößleriteMg(HAsO4) · 7H2OMon. 2/m : B2/b
8.CE.25MetaswitzeriteMn2+3(PO4)2 · 4H2OMon. 2/m : P2/b
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2OMon.
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1
8.CE.35BobierriteMg3(PO4)2 · 8H2OMon. 2/m : B2/b
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ErythriteCo3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
8.CE.40ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.45SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
8.CE.50CattiiteMg3(PO4)2 · 22H2OTric. 1 : P1
8.CE.55KoninckiteFe3+PO4 · 3H2OTet.
8.CE.60KaňkiteFeAsO4 · 3.5H2OMon.
8.CE.65SteigeriteAl(VO4) · 3H2OMon. 2/m : P21/m
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2OMon. 2/m : P2/m
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2OMon.
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2OMon.
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2OTric. 1 : P1
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2OTric.
8.CE.80SantabarbaraiteFe3+3(PO4)2(OH)3 · 5H2OAmor.
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)Tric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

39.2.6.1Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
39.2.6.1LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
39.2.6.2GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
39.2.6.4VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
39.2.6.6OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1

Other InformationHide

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 PradetiteHide

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 PradetiteHide

Localities for PradetiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
Pavel Škácha
France (TL)
 
  • Provence-Alpes-Côte d'Azur
    • Var
      • Le Pradet
H.Sarp & B.Dominik (1995): Archs Sci. Geneve,48,239-250.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Schenkenzell
        • Wittichen
          • Heubach Valley
Slotta, C. (2016): Von Carlhintzeit bis Pradeit: Neue Mineralfunde aus dem Schwarzwald. Lapis 41 (2), 30-31. (in German)
Mineral and/or Locality  
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