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Maxwellite

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Formula:
NaFe3+AsO4F
System:
Monoclinic
Hardness:
5 - 5½
Member of:
Name:
After Charles Henry Maxwell (1923– ), geologist with the U.S. Geological Survey, who studied the Taylor Creek district.
Isostructural with:

Classification of Maxwellite

Approved
Approval Year:
1987
8.BH.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
41.5.5.3

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
22.1.21

22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride

Physical Properties of Maxwellite

Hardness (Mohs):
5 - 5½

Optical Data of Maxwellite

Type:
Biaxial (+)
RI values:
nα = 1.748 nβ = 1.772 nγ = 1.798
2V:
Measured: 86° to 89°, Calculated: 90°
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v strong

Chemical Properties of Maxwellite

IMA Formula:
NaFe3+AsO4F
Elements listed in formula:

Crystallography of Maxwellite

Crystal System:
Monoclinic
Cell Parameters:
a = 7.16 Å, b = 8.78 Å, c = 6.68 Å
β = 114.58°
Ratio:
a:b:c = 0.815 : 1 : 0.761
Unit Cell Volume:
V 381.88 ų (Calculated from Unit Cell)

Type Occurrence of Maxwellite

Geological Setting of Type Material:
Formed as a rarity in miarolitic cavities in rhyolite adjacent to high-temperature veins in a hydrothermal tin deposit.

Relationship of Maxwellite to other Species

Series:
Forms a series with Durangite (see here)
Forms a series with Tilasite (see here)
Member of:
Other Members of Group:
DurangiteNaAl(AsO4)F
IsokiteCaMg(PO4)F
KononoviteNaMg(SO4)F
LacroixiteNaAl(PO4)F
PanasqueiraiteCaMg(PO4)(OH,F)
TilasiteCaMg(AsO4)F
8.BH.05ThadeuiteCaMg3(PO4)2(OH,F)2
8.BH.10DurangiteNaAlAsO4F
8.BH.10IsokiteCaMgPO4F
8.BH.10LacroixiteNaAl(PO4)F
8.BH.10PanasqueiraiteCaMgPO4(OH)
8.BH.10TilasiteCaMgAsO4F
8.BH.15DrugmanitePb2Fe3+(PO4)(PO3OH)(OH)2
8.BH.20BjarebyiteBaMn22+Al2(PO4)3(OH)3
8.BH.20CirroliteCa3Al2(PO4)3(OH)3
8.BH.20KulaniteBaFe22+Al2(PO4)3(OH)3
8.BH.20PenikisiteBaMg2Al2(PO4)3(OH)3
8.BH.20PerloffiteBaMn22+Fe23+(PO4)3(OH)3
8.BH.20JohntomaiteBaFe22+Fe23+(PO4)3(OH)3
8.BH.25BertossaiteLi2CaAl4(PO4)4(OH)4
8.BH.25PalermoiteLi2SrAl4(PO4)4(OH)4
8.BH.30CarminitePbFe23+(AsO4)2(OH)2
8.BH.30SewarditeCaFe23+(AsO4)2(OH)2
8.BH.35AdeliteCaMgAsO4(OH)
8.BH.35ArsendescloizitePbZnAsO4(OH)
8.BH.35AustiniteCaZnAsO4(OH)
8.BH.35CobaltaustiniteCaCoAsO4(OH)
8.BH.35ConichalciteCaCuAsO4(OH)
8.BH.35DuftitePbCuAsO4(OH)
8.BH.35GabrielsonitePbFeAsO4(OH)
8.BH.35NickelaustiniteCaNiAsO4(OH)
8.BH.35TangeiteCaCuVO4(OH)
8.BH.35GottlobiteCaMg(VO4)(OH)
8.BH.35HermannroseiteCaCu(PO4)(OH)
8.BH.40ČechitePbFe2+VO4(OH)
8.BH.40DescloizitePbZnVO4(OH)
8.BH.40MottramitePbCuVO4(OH)
8.BH.40PyrobelonitePbMn2+VO4(OH)
8.BH.45BayldoniteCu3PbO(AsO3OH)2(OH)2
8.BH.45VésigniéiteCu3Ba(VO4)2(OH)2
8.BH.50PaganoiteNiBi3+OAsO4
8.BH.55JagoweriteBaAl2(PO4)2(OH)2
8.BH.60AttakoliteCaMn2+Al4(HSiO4)(PO4)3(OH)4
8.BH.65LeningraditePbCu3(VO4)2Cl2
22.1.1AmblygoniteLiAlPO4F
22.1.2LacroixiteNaAl(PO4)F
22.1.3NatrophosphateNa7(PO4)2F · 19H2O
22.1.5NacaphiteNa2Ca(PO4)F
22.1.6ArctiteNa5Ca7Ba(PO4)6F3
22.1.7NefedoviteNa5Ca4(PO4)4F
22.1.9FluorapatiteCa5(PO4)3F
22.1.10HerderiteCaBePO4F
22.1.11IsokiteCaMgPO4F
22.1.12PanasqueiraiteCaMgPO4(OH)
22.1.13BabefphiteBaBePO4F
22.1.14FluelliteAl2(PO4)F2(OH) · 7H2O
22.1.15MinyuliteKAl2(PO4)2F · 4H2O
22.1.16MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
22.1.17BøggilditeNa2Sr2Al2(PO4)F9
22.1.18FluorstrophiteSrCaSr3(PO4)3F
22.1.19ViitaniemiiteNaCaAlPO4F3
22.1.20VäyryneniteMn2+Be(PO4)OH
22.1.22WagneriteMg2PO4F
22.1.23Triplite(Mn2+,Fe2+)2PO4(F,OH)
22.1.24Magniotriplite(Mg,Fe2+,Mn2+)2PO4F
22.1.25ZwieseliteFe2+Mn2+PO4F
22.1.26McauslaniteFe32+Al2(PO4)3(PO3OH)F · 18H2O
22.1.27RichelliteCaFe23+(PO4)2(OH,F)2
22.1.28SvabiteCa5(AsO4)3F
22.1.29TilasiteCaMgAsO4F
22.1.30Johnbaumite-MCa5(AsO4)3OH
22.1.31DurangiteNaAlAsO4F

Other Names for Maxwellite

Name in Other Languages:

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.

References for Maxwellite

Reference List:
Foord, E.E., P.F. Hlava, J.J. Fitzpatrick, R.C. Erd, and R.W. Hinton (1991) Maxwellite and squawcreekite, two new minerals from the Black Range tin district, Catron County, New Mexico, U.S.A. Neues Jahrbuch für Mineralogie, Monatshefte, 363–384. (2) (1992).

American Mineralogist: 77: 449 (abstract).

Cooper, M.A. and F.C. Hawthorne (1995) The crystal structure of maxwellite. Neues Jahrbuch für Mineralogie, Monatshefte, 97–104.

New Minerals (1997), New Minerals 1990-1994.

Internet Links for Maxwellite

mindat.org URL:
https://www.mindat.org/min-2605.html
Please feel free to link to this page.

Localities for Maxwellite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
USA (TL)
 
  • New Mexico
    • Catron Co.
      • Taylor Creek District
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996; Mineralogical Record: 20(5): 404.
    • Sierra Co.
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
Minerals of New Mexico 3rd ed.
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
Mineral and/or Locality  
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