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Pradetite
A valid IMA mineral species
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About Pradetite
Mineralized pillar in the museum
Cap Garonne Mine, Le Pradet, Toulon, Var, Provence-Alpes-Côte d'Azur, France
Cap Garonne Mine, Le Pradet, Toulon, 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:
Named for the city of Le Pradet, France, which is near the type locality of the Cap Garonne mine.
Unique Identifiers
Mindat ID:
30767
Long-form identifier:
mindat:1:1:30767:1
Similar Names
| Peridotite | A rock classification type |
IMA Classification of Pradetite
Approved
IMA status notes:
Redefined by the IMA
IMA Formula:
Co2+Cu2+4(As5+O4)2(As5+O3OH)2·9H2O
Approval year:
1991
Classification of Pradetite
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
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Pde | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
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(1) g/cm3 (Measured) 3.17 g/cm3 (Calculated)
Comment:
Calculated value uses powder data and empirical formula based on 25 O+OH apfu (Burke et al 2007).
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
Based on recorded range of RI values above.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r < v, strong
Optical Extinction:
X ∧ b 20.5° on (001); X ∧ b 35° on (100).
Pleochroism:
Weak
Comments:
Z = green, X and Y = colorless.
Chemistry of Pradetite
Mindat Formula:
CoCu4(AsO4)2(HAsO4)2 · 9H2O
Element Weights:
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
Morphology:
Fibers, very elongated parallel to [001]. Crystal forms are {001} and
{100}.
{100}.
Twinning:
Not observed.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.191 Å | (100) |
| 8.01 Å | (60) |
| 4.001 Å | (50) |
| 3.667 Å | (60) |
| 3.404 Å | (35) |
| 3.258 Å | (30) |
| 3.151 Å | (50) |
| 3.063 Å | (50) |
| 2.674 Å | (40) |
| 2.615 Å | (35) |
Comments:
Cap Garonne
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Pradetite
General Appearance of Type Material:
Fibrous aggregates consisting of individual very elongated (parallel to [001]) crystals (0.3 mm x 0.05 mm x 0.15 mm) and massive equidimensional grains (~ 0.2 mm).
Place of Conservation of Type Material:
Departement de Mineralogie du Museum d'Histoire Naturelle de Geneve, Switzerland, no. 477.081 (holotype).
Geological Setting of Type Material:
Secondary alteration mineral.
Associated Minerals at Type Locality:
Synonyms of Pradetite
Other Language Names for Pradetite
Relationship of Pradetite to other Species
Member of:
Other Members of Lindackerite 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 |
Common Associates
Related Minerals - Strunz-mindat Grouping
| 8.CE. | Monteneroite | Cu2+Mn2+2(AsO4)2 · 8H2O |
| 8.CE. | Belmonteite | CaMn2(AsO4)2 · 7H2O |
| 8.CE. | Zincocabrerite | ZnMg2(AsO4)2(H2O)8 |
| 8.CE.X | Babánekite | Cu3(AsO4)2 · 8H2O |
| 8.CE.05 | Chudobaite | Mg5(AsO4)2(AsO3OH)2 · 10H2O |
| 8.CE.05 | Geigerite | Mn2+5(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.10 | Newberyite | Mg(PO3OH) · 3H2O |
| 8.CE.10 | Manganonewberyite | Mn(PO3OH)(H2O)3 |
| 8.CE.15 | Fanguangite | (MoO2)(PO3OH) · 4H2O |
| 8.CE.15 | Brassite | Mg(HAsO4) · 4H2O |
| 8.CE.20 | Phosphorrösslerite | Mg(PO3OH) · 7H2O |
| 8.CE.20 | Rösslerite | Mg(HAsO4) · 7H2O |
| 8.CE.25 | Switzerite | Mn2+3(PO4)2 · 7H2O |
| 8.CE.25 | Metaswitzerite | Mn2+3(PO4)2 · 4H2O |
| 8.CE.30 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Klajite | MnCu4(AsO4)2(HAsO4)2 · 9-10H2O |
| 8.CE.30 | Hloušekite | (Ni,Co)Cu4(AsO4)2(AsO3OH)2 · 9H2O |
| 8.CE.30 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.35 | Bobierrite | Mg3(PO4)2 · 8H2O |
| 8.CE.40 | Barićite | (Mg,Fe)3(PO4)2 · 8H2O |
| 8.CE.40 | Parasymplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Gritsenkoite | CoMg2(AsO4)2(H2O)8 |
| 8.CE.40 | Cabrerite | NiMg2(AsO4)2 · 8H2O |
| 8.CE.40 | Pakhomovskyite | Co3(PO4)2 · 8H2O |
| 8.CE.40 | Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O |
| 8.CE.40 | Arupite | Ni3(PO4)2 · 8H2O |
| 8.CE.40 | Erythrite | Co3(AsO4)2 · 8H2O |
| 8.CE.40 | Hörnesite | Mg3(AsO4)2 · 8H2O |
| 8.CE.40 | Manganohörnesite | Mn2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Köttigite | Zn3(AsO4)2 · 8H2O |
| 8.CE.40 | Ferrisymplesite | Fe3+3(AsO4)2(OH)3 · 5H2O |
| 8.CE.40 | Annabergite | Ni3(AsO4)2 · 8H2O |
| 8.CE.45 | Symplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.50 | Cattiite | Mg3(PO4)2 · 22H2O |
| 8.CE.55 | Koninckite | Fe3+PO4 · 3H2O |
| 8.CE.60 | Kaňkite | FeAsO4 · 3.5H2O |
| 8.CE.60 | Hilarionite | Fe3+2(SO4)(AsO4)(OH) · 6H2O |
| 8.CE.65 | Steigerite | Al(VO4) · 3H2O |
| 8.CE.70 | Metaschoderite | Al2(PO4)(VO4) · 6H2O |
| 8.CE.70 | Schoderite | Al2(PO4)(VO4) · 8H2O |
| 8.CE.75 | Zigrasite | MgZr(PO4)2 · 4H2O |
| 8.CE.75 | 'UM2009-11-PO:CaHZr' | CaZr[PO4]2 · 4H2O |
| 8.CE.75 | Malhmoodite | FeZr(PO4)2 · 4H2O |
| 8.CE.80 | Santabarbaraite | Fe3+3(PO4)2(OH)3 · 5H2O |
| 8.CE.85 | Metaköttigite | (Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH) |
| 8.CE.90 | Slavkovite | Cu13(AsO4)6(AsO3OH)4 · 23H2O |
Fluorescence of Pradetite
Not fluorescent.
Other Information
Notes:
Soluble in HCl.
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 Pradetite
mindat.org URL:
https://www.mindat.org/min-30767.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Pradetite
Reference List:
Jambor, John L., Grew, Edward S., Roberts, Andrew C. (1996) New mineral names. American Mineralogist, 81. 1513-1518
Hybler, Jiří, Ondruš, Petr, Císařová, Ivana, Petříček, Václav, Veselovský, František (2004) Crystal structure of lindackerite, (Cu,Co,Ni)Cu4(AsO4)2(AsO3OH)2·9H2O from Jachymov, Czech Republic. European Journal of Mineralogy, 15 (6) 1035-1042 doi:10.1127/0935-1221/2003/0015-1035
Localities for Pradetite
Showing 3 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Pavel Škácha |
France (TL) | |
| Sarp et al. (1995) +3 other references |
Germany | |
| Slotta (2016) |
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Anton Mine, Heubach Valley, Wittichen, Schenkenzell, Rottweil, Freiburg Region, Baden-Württemberg, Germany