Natrodufrénite
A valid IMA mineral species
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About Natrodufrénite
Formula:
NaFe2+Fe3+5(PO4)4(OH)6 · 2H2O
Colour:
Greenish brown
Hardness:
3½ - 4½
Specific Gravity:
3.20
Crystal System:
Monoclinic
Member of:
Name:
For being the Na analogue of dufrénite.
Isostructural with:
Unique Identifiers
Mindat ID:
2854
Long-form identifier:
mindat:1:1:2854:3
IMA Classification of Natrodufrénite
Approved
Approval year:
1981
First published:
1982
Classification of Natrodufrénite
8.DK.15
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
42.9.1.3
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
19.14.6
19 : Phosphates
14 : Phosphates of Fe and other metals
19 : Phosphates
14 : Phosphates of Fe and other metals
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 |
|---|---|---|
| Ndf | 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 Natrodufrénite
Transparency:
Translucent
Colour:
Greenish brown
Streak:
Green
Hardness:
3½ - 4½ on Mohs scale
Tenacity:
Brittle
Density:
3.20(3) g/cm3 (Measured) 3.23 g/cm3 (Calculated)
Optical Data of Natrodufrénite
Type:
Biaxial (+)
RI values:
nα = 1.756 nγ = 1.775
Max. Birefringence:
δ = 0.019
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 30um 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 cross polars.
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 30um 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 cross polars.
Surface Relief:
Moderate
Dispersion:
distinct to strong
Pleochroism:
Visible
Comments:
X = pale yellow; Z = dark green.
Chemistry of Natrodufrénite
Mindat Formula:
NaFe2+Fe3+5(PO4)4(OH)6 · 2H2O
Element Weights:
Crystallography of Natrodufrénite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 25.83(2) Å, b = 5.150(3) Å, c = 13.772(9) Å
β = 111.53°
β = 111.53°
Ratio:
a:b:c = 5.016 : 1 : 2.674
Unit Cell V:
1,704.19 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Radially fibrous spherulites, to 5 mm, may be in warty nodules.
Comment:
By analogy to dufrénite.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.04 Å | (80) |
| 5.040 Å | (60) |
| 4.124 Å | (50) |
| 3.400 Å | (80) |
| 3.204 Å | (80) |
| 3.152 Å | (100) |
| 2.989 Å | (50) |
Comments:
Close to dufrénite.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Natrodufrénite
General Appearance of Type Material:
Blue-green spheres of compact radiating fibers up to 0.5 cm in diameter.
Place of Conservation of Type Material:
Natural History Museum, Paris, France, 106384, 106385.
National School of Mines, Paris, France, 18329.
National School of Mines, Paris, France, 18329.
Geological Setting of Type Material:
Limonitic ore bed; formed by low temperature, supergene alteration.
Associated Minerals at Type Locality:
Synonyms of Natrodufrénite
Other Language Names for Natrodufrénite
German:Natrodufrénit
Natrodufrenit
Natrodufrenit
Spanish:Natrodufrenita
Relationship of Natrodufrénite to other Species
Member of:
Other Members of Dufrénite Group:
| Bimbowrieite | NaMgFe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Burangaite | NaFe2+Al5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Gayite | NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Matioliite | NaMgAl5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
Common Associates
Associated Minerals Based on Photo Data:
| 26 photos of Natrodufrénite associated with Cyrilovite | NaFe3+3(PO4)2(OH)4 · 2H2O |
| 20 photos of Natrodufrénite associated with Kidwellite | NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33 |
| 15 photos of Natrodufrénite associated with Strengite | FePO4 · 2H2O |
| 12 photos of Natrodufrénite associated with Leucophosphite | KFe3+2(PO4)2(OH) · 2H2O |
| 10 photos of Natrodufrénite associated with Cacoxenite | Fe3+24AlO6(PO4)17(OH)12 · 75H2O |
| 8 photos of Natrodufrénite associated with Quartz | SiO2 |
| 7 photos of Natrodufrénite associated with Wavellite | Al3(PO4)2(OH)3 · 5H2O |
| 4 photos of Natrodufrénite associated with Kapundaite | NaCaFe4(PO4)4(OH)3 · 5H2O |
| 4 photos of Natrodufrénite associated with Kintoreite | PbFe3(PO4)(PO3OH)(OH)6 |
| 3 photos of Natrodufrénite associated with Goethite | Fe3+O(OH) |
Related Minerals - Strunz-mindat Grouping
| 8.DK. | Richelsdorfite | Ca2Cu5Sb(AsO4)4(OH)6Cl · 6H2O |
| 8.DK. | Bimbowrieite | NaMgFe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK. | Puttapaite | Pb2Mn2+2ZnCr3+4O2(AsO4)4(OH)6 · 12H2O |
| 8.DK.10 | Thalliumpharmacosiderite | TlFe4[(AsO4)3(OH)4] · 4H2O |
| 8.DK.10 | Natropharmacosiderite | NaFe3+4(AsO4)3(OH)4 · 4H2O |
| 8.DK.10 | Pharmacosiderite | KFe3+4(AsO4)3(OH)4 · 6-7H2O |
| 8.DK.10 | Plumbopharmacosiderite | Pb0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
| 8.DK.10 | Strontiopharmacosiderite | Sr0.5Fe4[(AsO4)3(OH)4] · 4H2O |
| 8.DK.10 | Bariopharmacosiderite | Ba0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
| 8.DK.10 | Hydroniumpharmacosiderite | (H3O)Fe4(AsO4)3(OH)4 · 4H2O |
| 8.DK.12 | Hydroniumpharmacoalumite | (H3O)Al4(AsO4)3(OH)4 · 4.5H2O |
| 8.DK.12 | Bariopharmacoalumite | Ba0.5Al4(AsO4)3(OH)4 · 4H2O |
| 8.DK.12 | Pharmacoalumite | KAl4(AsO4)3(OH)4 · 6.5H2O |
| 8.DK.12 | Calciopharmacoalumite | Ca0.5Al4(AsO4)3(OH)4 · 5H2O |
| 8.DK.12 | Natropharmacoalumite | NaAl4(AsO4)3(OH)4 · 4H2O |
| 8.DK.15 | Matioliite | NaMgAl5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Burangaite | NaFe2+Al5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Gayite | NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK.20 | Kidwellite | NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33 |
| 8.DK.25 | Bleasdaleite | (Ca,Fe3+)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13 |
| 8.DK.30 | Matulaite | (Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O |
| 8.DK.35 | Krasnovite | Ba(Al,Mg)(PO4,CO3)(OH)2 · H2O |
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.
Internet Links for Natrodufrénite
mindat.org URL:
https://www.mindat.org/min-2854.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Natrodufrénite
Reference List:
Fontan, François, Pillard, François, Permingeat, François (1982) La natrodufrénite (Na, ⃞)(Fe+++, Fe++)(Fe+++, Al) 5 (PO4) 4 (OH) 6• 2H2O, une nouvelle espèce minérale du groupe de la dufrénite. Bulletin de Minéralogie, 105 (4). 321-326 doi:10.3406/bulmi.1982.7623
Roda-Robles, Encarnación, Fontan, François, Pesquera Pérez, Alfonso, Keller, Paul (1998) The Fe-Mn phosphate associations from the Pinilla de Fermoselle pegmatite, Zamora, Spain: occurrence of kryzhanovskite and natrodufrénite. European Journal of Mineralogy, 10 (1) 155-168 doi:10.1127/ejm/10/1/0155
Localities for Natrodufrénite
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.
Argentina | |
| Kampf et al. (2010) |
Australia | |
| Birch et al. (1997) |
| Day (1998) | |
| Day et al. (1996) |
| Derrick |
| Peter Elliott |
| Peter Elliott |
| Vince Peisley specimen |
| |
| Peter Elliott |
| Australian Journal of Mineralogy |
| Elliott et al. (2025) |
| Australian Journal of Mineralogy |
| |
| P. Sutton (2007) |
| Birch (1996) |
Austria | |
| Brandstätter et al. (1990) +1 other reference |
Brazil | |
| Sergio Varvello collection |
| Sergio Varvello collection |
Chile | |
| XRD by Gerhard Möhn |
| maurizio dini collection - analysed ... |
| maurizio dini collection - analysed ... |
| Sulphides analysed by geology dep. of ... +1 other reference |
Czech Republic | |
| Sejkora et al. (2006) |
| Sejkora et al. (2006) | |
| Sejkora |
| Škoda |
| Vrtiška et al. (with English summary) |
| Sejkora et al. (2011) |
| Vrtiška et al. (2017) |
| Škoda et al. (2007) +1 other reference |
France | |
| Yannick Vessely collection - SEM-EDS ... |
| Uwe Kolitsch (SXRD + SEM-EDS) |
| Boisson et al. (2000) +1 other reference | |
| Pierre Le Roch & Jean-Marc Johannet ... |
| Bull.Mineral. (1982) |
| Jean-Marc Johannet collection (unpublished SEM-EDS analyses by Vincent Bourgouin) |
| Gayraud et al. (2011) |
Germany | |
| Collected by Hans-Peter Maaßen +1 other reference |
| Dill et al. (2012) |
| Blaß (2002) |
| Hucko (2010) |
| SEM-EDS |
| Wittern (2001) |
Hungary | |
| collector: Regina Körmendy |
Italy | |
| Bruno Marello collection |
| Marco Ciriotti 2010 | |
| Gianluca Armellino et al. (2024) +1 other reference | |
Morocco | |
| Favreau (2012) |
Portugal | |
| Alves (n.d.) |
| Identified in Rebentão Mine |
| Nuno Afonso collection |
Spain | |
| www.foro-minerales.com (2022) |
| www.foro-minerales.com (2022) +1 other reference | |
| Christian Rewitzer collection |
| Roda-Robles et al. (1998) |
| Viñals et al. (2011) |
USA | |
| Henry Barwood |
| Henry Barwood | |
| Grant et al. (2005) |
| Silver Coin Mine. Compact Disc. Paul ... |
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Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany