Maxwellite Mineral Data

Maxwellite Mineral Data +

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General Maxwellite Information

Chemical Formula:

NaFe+++(AsO4)F

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

Empirical Formula:

NaFe³⁺(AsO₄)F

IMA Status:

Approved IMA 1991

Locality:

Black Range tin district, Carton County, New Mexico, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Charles Henry Maxwell (1923-), U. S. Geological Survey.

Synonym:

ICSD 81122

IMA1987-044

PDF 46-1386

Maxwellite Image

Images:

Maxwellite

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

Axial Ratios:

a:b:c =0.8156:1:0.7616

Cell Dimensions:

a = 7.161, b = 8.78, c = 6.687, Z = 4; beta = 114.58° V = 382.34 Den(Calc)= 4.11

Crystal System:

MonoclinicSpace Group: Aa,A2/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.291(1), 2.614(0.8), 3.039(0.75),

Crystal Structure:

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Cooper M A , Hawthorne F C , Neues Jahrbuch fur Mineralogie, Monatshefte , 1995 (1995) p.97-104, The crystal structure of maxwellite, Locality: Squaw Creek, Catron County, New Mexico, USA

Physical Properties of Maxwellite

Cleavage:

[110] Good

Color:

Dark red.

Density:

3.9

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Vitreous (Glassy)

Streak:

red orange

Optical Properties of Maxwellite

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

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.

Pleochroism (x):

medium yellow orange.

Pleochroism (y):

medium yellow orange.

Pleochroism (z):

dark orangish red.

Calculated Properties of Maxwellite

Electron Density:

r_electron=3.66 gm/cc
note: r_Maxwellite=3.90 gm/cc.

Fermion Index

Fermion Index = 0.00513
Boson Index = 0.99487

Photoelectric:

PE_Maxwellite= 29.36 barns/electron
U=PE_Maxwellite x r_electron= 107.36 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Maxwellite is Not Radioactive

Maxwellite Classification

Dana Class:

41.5.5.3 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.5)Dana Group

41.5.5.1 Lacroixite NaAl(PO4)F C 2/c 2/m

41.5.5.2 Durangite NaAl(AsO4)F C 2/c 2/m

41.5.5.3 Maxwellite NaFe(AsO4)F Aa,A2/a Mono

Strunz Class:

VII/B.25-55 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.25 - Isokite - Thadeuite series

VII/B.25-10 Isokite CaMg(PO4)F C 2/c 2/m

VII/B.25-20 Panasqueiraite CaMg(PO4)(OH,F) C 2/c 2/m

VII/B.25-30 Tilasite CaMg(AsO4)F C 2/c 2/m

VII/B.25-40 Lacroixite NaAl(PO4)F C 2/c 2/m

VII/B.25-50 Durangite NaAl(AsO4)F C 2/c 2/m

VII/B.25-55 Maxwellite NaFe(AsO4)F Aa,A2/a Mono

VII/B.25-60 Nacaphite Na(Na,Ca)2(PO4)F P1 1

VII/B.25-70 Spodiosite? Ca2(PO4)F Pbcm 2/m 2/m 2/m

VII/B.25-80 Thadeuite (Ca,Mn)(Mg,Fe,Mn)3(PO4)2(OH,F)2 C 222₁ 2 2 2

Other Maxwellite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Maxwellite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Maxwellite Specimen Label here :

Maxwellite

NaFe+++(AsO4)F
Dana No: 41.5.5.3 Strunz No: VII/B.25-55
Locality:

Notes: