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Phoxite

A valid IMA mineral species
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04258780015767735819789.jpg
Phoxite

125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA
00842620015767735822759.jpg
Phoxite

125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA
04258780015767735819789.jpg
Phoxite

125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA
00842620015767735822759.jpg
Phoxite

125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA
04258780015767735819789.jpg
Phoxite

125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA
00842620015767735822759.jpg
Phoxite

125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA
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About PhoxiteHide

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 IdentifiersHide

Mindat ID:
52918
Long-form identifier:
mindat:1:1:52918:5
GUID
(UUID V4):
8d2e1805-aeb2-4c9d-b024-68f007043e6c

IMA Classification of PhoxiteHide

Classification of PhoxiteHide

Strunz-mindat (2024):
10.AB.60

10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
PhxIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of PhoxiteHide

Lustre:
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}
Fracture:
Irregular/Uneven
Density:
1.98(2) g/cm3 (Measured)     1.987 g/cm3 (Calculated)
Comment:
using the empirical formula

Optical Data of PhoxiteHide

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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemistry of PhoxiteHide

Mindat Formula:
(NH4)2Mg2(C2O4)(PO3OH)2(H2O)4
Elements listed:
C, H, Mg, N, O, P - search for minerals with similar chemistry

Crystallography of PhoxiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 7.2962(3) Å, b = 13.5993(4) Å, c = 7.8334(6) Å
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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest 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 PhoxiteHide

Type Locality:
ⓘ 125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA
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:
Antipinite
Reference:
Kampf, A.R., Celestian, A.J., Nash, B.P., Marty, J. (2019) Phoxite, (NH4)2Mg2(C2O4(PO3OH)2(H2O)4, the first phosphate-oxalate mineral. American Mineralogist: 104(7): 973-979.

Synonyms of PhoxiteHide

Related Minerals - Strunz-mindat GroupingHide

10.AB.Deveroite-(Ce)Ce2(C2O4)3 · 10H2OMon. 2/m : P21/b
10.AB.XFalottaiteMnC2O4 · 3H2OOrth. mmm (2/m 2/m 2/m)
10.AB.Uroxite [(UO2)2(C2O4)(OH)2(H2O)2] · H2OMon. 2/m : P21/b
10.AB.AndreybulakhiteNi(C2O4) · 2H2OMon. 2/m : B2/b
10.AB.EdwindavisiteCu(C2O4)(NH3)Orth. mmm (2/m 2/m 2/m) : Pbca
10.AB.05HumboldtineFe2+(C2O4) · 2H2OMon. 2/m
10.AB.05LindbergiteMn2+(C2O4) · 2H2OMon. 2/m
10.AB.05KatsarositeZn(C2O4) · 2H2OMon. 2/m : B2/b
10.AB.10GlushinskiteMg(C2O4) · 2H2OMon. 2/m : B2/b
10.AB.15MoolooiteCu(C2O4) · nH2OOrth.
10.AB.20StepanoviteNaMgFe3+(C2O4)3 · 8-9H2OTrig. 3m : P3c1
10.AB.25MinguzziteK3Fe3+(C2O4)3 · 3H2OMon. 2/m : P21/b
10.AB.30WheatleyiteNa2Cu(C2O4)2 · 2H2OTric. 1 : P1
10.AB.35ZhemchuzhnikoviteNaMgAl(C2O4)3 · 8H2OTrig. 3m : P3c1
10.AB.40WeddelliteCa(C2O4) · (2.5-x)H2OTet. 4/m : I4/m
10.AB.45WhewelliteCa(C2O4) · H2OMon. 2/m : P21/b
10.AB.47FiemmeiteCu2(C2O4)(OH)2 · 2H2OMon. 2/m : P21/b
10.AB.50CaoxiteCa(C2O4) · 3H2OTric. 1 : P1
10.AB.50MiddlebackiteCu2C2O4(OH)2Mon. 2/m : P21/b
10.AB.52Metauroxite(UO2)2(C2O4)(OH)2(H2O)2Tric. 1 : P1
10.AB.55Oxammite(NH4)2(C2O4) · H2OOrth. 2 2 2 : P21 21 2
10.AB.60NatroxalateNa2(C2O4)Mon. 2/m : P21/b
10.AB.60Carboferriphoxite[(NH4)K(H2CO3)][Fe3+(HPO4)(H2PO4)(C2O4)]Tric.
10.AB.60Ferriphoxite[(NH4)2K(H2O)][Fe3+(HPO4)2(C2O4)]Mon. 2/m : B2/b
10.AB.65Coskrenite-(Ce)(Ce,Nd,La)2(C2O4)(SO4)2 · 12H2OTric.
10.AB.70Levinsonite-(Y)(Y,Nd,La)Al(C2O4)(SO4)2 · 12H2OMon. 2/m
10.AB.75Zugshunstite-(Ce)(Ce,Nd,La)Al(C2O4)(SO4)2 · 12H2OMon. 2/m : B2/b
10.AB.80NovgorodovaiteCa2(C2O4)Cl2 · 2H2OMon. 2/m

Other InformationHide

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 PhoxiteHide

References for PhoxiteHide

Localities for PhoxiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia
 
  • Western Australia
    • Dundas Shire
      • Madura Roadhouse
Kampf et al. (2019)
USA (TL)
 
  • Arizona
    • Maricopa County
      • Painted Rock Mountains
        • Painted Rock Mining District
          • Theba
            • Rowley Mine
Kampf et al. (2019)
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