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Phoxite
A valid IMA mineral species
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About Phoxite
Formula:
(NH4)2Mg2(C2O4)(PO3OH)2(H2O)4
Colour:
colorless
Lustre:
Vitreous, Greasy
Hardness:
2½
Specific Gravity:
1.98
Crystal System:
Monoclinic
Name:
The name “phoxite” reflects the fact that the mineral contains both phosphate (ph) and oxalate (ox) groups.
New structure type. Unique combination of elements. Also unique combination of anions: the first mineral with essential (hydroxy)phosphate and oxalate anions.
Unique Identifiers
Mindat ID:
52918
Long-form identifier:
mindat:1:1:52918:5
Similar Names
| Fuxite | A synonym of 'Fuchsite' | |
| Vauxite | A valid IMA mineral species - grandfathered | Fe2+Al2(PO4)2(OH)2 · 6H2O |
IMA Classification of Phoxite
Approved
IMA Formula:
(N3-H4)2Mg2((C2)6+O4)(PO3OH)2(H2O)4
Approval year:
2018
First published:
2019
Classification of Phoxite
10.AB.60
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
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 |
|---|---|---|
| Phx | 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 Phoxite
Vitreous, Greasy
Transparency:
Transparent
Colour:
Colorless
Comment:
light to medium brown or beige due to inclusions
Streak:
White
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
fair {100}
fair {100}
Fracture:
Irregular/Uneven
Density:
1.98(2) g/cm3 (Measured) 1.987 g/cm3 (Calculated)
Comment:
using the empirical formula
Optical Data of Phoxite
Type:
Biaxial (-)
RI values:
nα = 1.499(1) nβ = 1.541(1) nγ = 1.542(1)
2V:
Measured: 16° (1), Calculated: 17.2°
Birefringence:
Slight r < v dispersion was observed.
Max. Birefringence:
δ = 0.043
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:
None to Very Low
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.
Pleochroism:
Non-pleochroic
Chemistry of Phoxite
Mindat Formula:
(NH4)2Mg2(C2O4)(PO3OH)2(H2O)4
Element Weights:
Crystallography of Phoxite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/c
Setting:
P21/c
Cell Parameters:
a = 7.2962(3) Å, b = 13.5993(4) Å, c = 7.8334(6) Å
β = 108.271(8)°
β = 108.271(8)°
Ratio:
a:b:c = 0.537 : 1 : 0.576
Unit Cell V:
738.07 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.17 Å | (100) |
| 5.57 Å | (85) |
| 3.799 Å | (60) |
| 3.377 Å | (59) |
| 2.914 Å | (72) |
| 3.536 Å | (32) |
| 2.425 Å | (37) |
| 2.275 Å | (63) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 52 : Guano- and urine-derived minerals | <0.4 |
Geological Setting:
found in a hot and humid area of the mine in an unusual bat-guano-related, post-mining assemblage
Type Occurrence of Phoxite
General Appearance of Type Material:
composite blades, up to about 0.4 mm in maximum dimension, growing in complex intergrowths
Place of Conservation of Type Material:
Mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Blvd, Los Angeles, California, USA, catalogue numbers 66697, 66698, 66699 and 66700 (cotypes)
Associated Minerals at Type Locality:
Synonyms of Phoxite
Other Language Names for Phoxite
Related Minerals - Strunz-mindat Grouping
| 10.AB. | Deveroite-(Ce) | Ce2(C2O4)3 · 10H2O |
| 10.AB. | Edwindavisite | Cu(C2O4)(NH3) |
| 10.AB.X | Falottaite | MnC2O4 · 3H2O |
| 10.AB. | Uroxite | [(UO2)2(C2O4)(OH)2(H2O)2] · H2O |
| 10.AB.05 | Katsarosite | Zn(C2O4) · 2H2O |
| 10.AB.05 | Andreybulakhite | Ni(C2O4) · 2H2O |
| 10.AB.05 | Humboldtine | Fe2+(C2O4) · 2H2O |
| 10.AB.05 | Lindbergite | Mn2+(C2O4) · 2H2O |
| 10.AB.10 | Glushinskite | Mg(C2O4) · 2H2O |
| 10.AB.15 | Moolooite | Cu(C2O4) · nH2O |
| 10.AB.20 | Stepanovite | NaMgFe3+(C2O4)3 · 8-9H2O |
| 10.AB.25 | Minguzzite | K3Fe3+(C2O4)3 · 3H2O |
| 10.AB.30 | Wheatleyite | Na2Cu(C2O4)2 · 2H2O |
| 10.AB.35 | Zhemchuzhnikovite | NaMgAl(C2O4)3 · 8H2O |
| 10.AB.40 | Weddellite | Ca(C2O4) · (2.5-x)H2O |
| 10.AB.45 | Whewellite | Ca(C2O4) · H2O |
| 10.AB.47 | Fiemmeite | Cu2(C2O4)(OH)2 · 2H2O |
| 10.AB.50 | Caoxite | Ca(C2O4) · 3H2O |
| 10.AB.50 | Middlebackite | Cu2C2O4(OH)2 |
| 10.AB.52 | Metauroxite | (UO2)2(C2O4)(OH)2(H2O)2 |
| 10.AB.55 | Oxammite | (NH4)2(C2O4) · H2O |
| 10.AB.60 | Natroxalate | Na2(C2O4) |
| 10.AB.60 | Carboferriphoxite | [(NH4)K(H2CO3)][Fe3+(HPO4)(H2PO4)(C2O4)] |
| 10.AB.60 | Ferriphoxite | [(NH4)2K(H2O)][Fe3+(HPO4)2(C2O4)] |
| 10.AB.65 | Coskrenite-(Ce) | Ce2(SO4)2(C2O4) · 8H2O |
| 10.AB.70 | Levinsonite-(Y) | (Y,Nd,La)Al(C2O4)(SO4)2 · 12H2O |
| 10.AB.75 | Zugshunstite-(Ce) | (Ce,Nd,La)Al(C2O4)(SO4)2 · 12H2O |
| 10.AB.80 | Novgorodovaite | Ca2(C2O4)Cl2 · 2H2O |
Other Information
Notes:
insoluble at room temperature in H2O, strong acids (HCl, H2SO4, HNO3) and strong base (concentrated NaOH aqueous solution)
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 Phoxite
mindat.org URL:
https://www.mindat.org/min-52918.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Phoxite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) CNMNC Newsletter No 43, New minerals and nomenclature modifications approved in 2018. Mineralogical Magazine, 82 (3) 779-785 doi:10.1180/mgm.2018.72p.783
Localities for Phoxite
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.
Australia | |
| Kampf et al. (2019) |
USA (TL) | |
| Kampf et al. (2019) +1 other reference |
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125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA