Fluorowardite
A valid IMA mineral species
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About Fluorowardite
Formula:
NaAl3(PO4)2F2(OH)2(H2O)2
Colour:
Colorless to white or cream-colored
Lustre:
Vitreous, Pearly
Hardness:
5
Specific Gravity:
2.760 (Calculated)
Crystal System:
Tetragonal
Member of:
Name:
For the mineral wardite and its fluorine content.
Unique Identifiers
Mindat ID:
42790
Long-form identifier:
mindat:1:1:42790:2
IMA Classification of Fluorowardite
Approved
IMA Formula:
NaAl3(PO4)2F2(OH)2·2H2O
Approval year:
2012
First published:
2014
Classification of Fluorowardite
8.DL.10
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
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 |
|---|---|---|
| Fwd | 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 Fluorowardite
Vitreous, Pearly
Transparency:
Transparent, Translucent
Colour:
Colorless to white or cream-colored
Streak:
White
Hardness:
5 on Mohs scale
Comment:
about 5
Tenacity:
Brittle
Cleavage:
Perfect
on {001}
on {001}
Fracture:
Irregular/Uneven
Density:
2.760 g/cm3 (Calculated)
Optical Data of Fluorowardite
Type:
Uniaxial (+)
RI values:
nω = 1.576(2) nε = 1.584(2)
Max. Birefringence:
δ = 0.008
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:
Moderate (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 uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Pleochroism:
Non-pleochroic
Chemistry of Fluorowardite
Mindat Formula:
NaAl3(PO4)2F2(OH)2(H2O)2
Element Weights:
Crystallography of Fluorowardite
Crystal System:
Tetragonal
Class (H-M):
422 - Trapezohedral
Space Group:
P41212
Setting:
P41212
Cell Parameters:
a = 7.077(2) Å, c = 19.227(3) Å
Ratio:
a:c = 1 : 2.717
Unit Cell V:
962.8 ų
Z:
4
Morphology:
Tetragonal-pyramidal crystals
Crystal Structure
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Unit Cell | Unit Cell Packed
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Unit Cell | Unit Cell Packed
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2D | Stereo | Red-Blue | Red-Cyan
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View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0020022 | Fluorowardite | Kampf A R, Adams P M, Housley R M, Rossman G R (2014) Fluorowardite, NaAl3(PO4)2(OH)2F2*2H2O, the fluorine analog of wardite from the Silver Coin mine, Valmy, Nevada American Mineralogist 99 804-810 | 2014 | Silver Coin mine, Valmy, Nevada, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.766 Å | (100) |
| 3.099 Å | (75) |
| 3.008 Å | (62) |
| 2.834 Å | (28) |
| 2.597 Å | (56) |
| 1.763 Å | (32) |
| 1.659 Å | (29) |
| 1.523 Å | (49) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Fluorowardite
General Appearance of Type Material:
tetragonal-pyramidal crystals up to 0.1 mm
in diameter
in diameter
Place of Conservation of Type Material:
Mineral Sciences Department, Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers 57659 and 63810
Geological Setting of Type Material:
a low-temperature secondary mineral in complex phosphate assemblages rich in Al, Na, and F.
Associated Minerals at Type Locality:
Synonyms of Fluorowardite
Other Language Names for Fluorowardite
Dutch:Fluorowardiet
German:Fluorowardit
Relationship of Fluorowardite to other Species
Member of:
Other Members of Wardite Group:
| Cyrilovite | NaFe3+3(PO4)2(OH)4 · 2H2O | Tet. 422 : P41212 |
| Millisite | (Na,K)CaAl6(PO4)4(OH)9 · 3H2O | Tet. |
| Wardite | NaAl3(PO4)2(OH)4 · 2H2O | Tet. 422 : P41212 |
Common Associates
Associations Based on Photo Data:
| 1 photo of Fluorowardite associated with Kidwellite | NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33 |
Related Minerals - Strunz-mindat Grouping
| 8.DL.05 | Foggite | CaAl(PO4)(OH)2 · H2O |
| 8.DL.10 | Wardite | NaAl3(PO4)2(OH)4 · 2H2O |
| 8.DL.10 | Millisite | (Na,K)CaAl6(PO4)4(OH)9 · 3H2O |
| 8.DL.10 | Cyrilovite | NaFe3+3(PO4)2(OH)4 · 2H2O |
| 8.DL.15 | Petersite-(Ce) | CeCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Nd) | NdCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Y) | YCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Ce) | CeCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | 'Agardite-(Dy)' | (Dy,La)Cu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(La) | LaCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Petersite-(Y) | YCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Zálesíite | CaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O |
| 8.DL.15 | Mixite | BiCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Petersite-(La) | LaCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Goudeyite | AlCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Calciopetersite | CaCu6(PO4)2(PO3OH)(OH)6 · 3H2O |
| 8.DL.15 | Plumboagardite | PbCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O |
| 8.DL.20 | Dugganite | Pb3Zn3(AsO4)2(TeO6) |
| 8.DL.20 | Wallkilldellite | Ca2Mn2+3(AsO4)2(OH)4 · 9H2O |
| 8.DL.20 | Wallkilldellite-(Fe) | (Ca,Cu)4Fe2+6(AsO4,SiO4)4(OH,O)8 · 18H2O |
| 8.DL.20 | Cheremnykhite | Pb3Zn3(VO4)2(TeO6) |
| 8.DL.20 | Kuksite | Pb3Zn3(PO4)2(TeO6) |
| 8.DL.25 | Angastonite | CaMgAl2(PO4)2(OH)4 · 7H2O |
| 8.DL.30 | Långbanshyttanite | Pb2Mn2Mg(AsO4)2(OH)4 · 6H2O |
Fluorescence of Fluorowardite
none
Other Information
Health Risks:
Internet Links for Fluorowardite
mindat.org URL:
https://www.mindat.org/min-42790.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Fluorowardite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2012) New minerals and nomenclature modifications approved in 2012. CNMNC Newsletter No 13. Mineralogical Magazine, 76 (3) 807-817 doi:10.1180/minmag.2012.076.3.26
Localities for Fluorowardite
Showing 2 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.
Spain | |
| Calvo Rebollar et al. (2024) |
USA (TL) | |
| Williams et al. (2012) +1 other reference |
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Silver Coin Mine, Valmy, Iron Point Mining District, Humboldt County, Nevada, USA