Mineralogy Database

Maxwellite Mineral Data

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General Maxwellite Information

Help on Chemical  Formula: Chemical Formula: NaFe+++(AsO4)F
Help on Composition: Composition: Molecular Weight = 236.75 gm
   Sodium     9.71 %  Na   13.09 % Na2O
   Iron      23.59 %  Fe   33.73 % Fe2O3
   Arsenic   31.65 %  As   48.54 % As2O5
   Oxygen    27.03 %  O
   Fluorine   8.02 %  F     8.02 % F
               -   %   F    -3.38 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaFe3+(AsO4)F
Help on IMA Status: IMA Status: Approved IMA 1991
Help on Locality: Locality: Black Range tin district, Carton County, New Mexico, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Charles Henry Maxwell (1923-), U. S. Geological Survey.
Help on Name Pronunciation: Name Pronunciation: Maxwellite + Pronunciation Say MAXWELLITE
Help on Synonym: Synonym: ICSD 81122
  PDF 46-1386

Maxwellite Image

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Comments: Minute red translucent maxwellite crystal in rhyolite.
Location: Squaw Creek Tin Mine, Black Range, Catron County, New Mexico, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Maxwellite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8156:1:0.7616
Help on Cell Dimensions: Cell Dimensions: a = 7.161, b = 8.78, c = 6.687, Z = 4; beta = 114.58° V = 382.34 Den(Calc)= 4.11
Help on Crystal System: Crystal System: Monoclinic Space Group: Aa,A2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.291(1), 2.614(0.8), 3.039(0.75),

Physical Properties of Maxwellite

Help on Cleavage: Cleavage: {110} Good
Help on Color: Color: Dark red.
Help on Density: Density: 3.9
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: red orange

Optical Properties of Maxwellite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.072 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.119 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.188,KPDmeas= 0.1981,KC= 0.2135
Ncalc = 1.83 - 1.88
Help on Optical Data: Optical Data: Biaxial (+), a=1.748, b=1.772, g=1.798, bire=0.0500, 2V(Calc)=90, 2V(Meas)=86-89. Dispersion r > v strong.
Help on Pleochroism (x): Pleochroism (x): medium yellow orange.
Help on Pleochroism (y): Pleochroism (y): medium yellow orange.
Help on Pleochroism (z): Pleochroism (z): dark orangish red.

Calculated Properties of Maxwellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.66 gm/cc
note: Specific Gravity of Maxwellite =3.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0051305293
Boson Index = 0.9948694707
Help on Photoelectric: Photoelectric: PEMaxwellite = 29.36 barns/electron
U=PEMaxwellite x rElectron Density= 107.36 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Maxwellite is Not Radioactive

Maxwellite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.05)where (A B)2 (XO4) Zq
  (41.05.05)Lacroixite Group Lacroixite NaAl(PO4)F C 2/c 2/m Durangite NaAl(AsO4)F C 2/c 2/m Maxwellite NaFe(AsO4)F Aa,A2/a Mono
Help on  Strunz Class: Strunz Class: 08.BH.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1
08.BH.10 Durangite NaAl(AsO4)F C 2/c 2/m
08.BH.10 Isokite CaMg(PO4)F C 2/c 2/m
08.BH.10 Lacroixite NaAl(PO4)F C 2/c 2/m
08.BH.10 Maxwellite NaFe(AsO4)F Aa,A2/a Mono
08.BH.10 Panasqueiraite CaMg(PO4)(OH,F) C 2/c 2/m
08.BH.10 Tilasite CaMg(AsO4)F C 2/c 2/m

Other Maxwellite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Maxwellite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.BH.10





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