Durangite Mineral Data

Durangite Mineral Data +

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General Durangite Information

Chemical Formula:

NaAl(AsO4)F

Composition:

Molecular Weight = 207.89 gm

Sodium 11.06 % Na 14.91 % Na₂O

Aluminum 12.98 % Al 24.52 % Al₂O₃

Arsenic 36.04 % As 55.28 % As₂O₅

Oxygen 30.78 % O

Fluorine 9.14 % F 9.14 % F

- % F -3.85 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaAl(AsO₄)F

IMA Status:

Valid Species (Pre-IMA) 1869

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 30205

PDF 36-424

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Durangite Crystallography

Axial Ratios:

a:b:c =0.7719:1:0.8269

Cell Dimensions:

a = 6.579, b = 8.523, c = 7.048, Z = 4; beta = 115.47° V = 356.79 Den(Calc)= 3.87

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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Crystal Structure:

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Kokkoros P , Zeitschrift fur Kristallographie , 99 (1938) p.38-49, Uber die struktur des durangit NaAlF[AsO4], Locality: Durango, Mexico

Physical Properties of Durangite

Cleavage:

[???] Indistinct, [110] Distinct

Color:

Light yellow, Dark green, Orange red, Red.

Density:

3.9

Diaphaniety:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

yellow

Optical Properties of Durangite

Gladstone-Dale:

CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1716,KPDmeas= 0.1703,KC= 0.1729

Optical Data:

Biaxial (-), a=1.634, b=1.673, g=1.685, bire=0.0510, 2V(Calc)=56, 2V(Meas)=45.

Calculated Properties of Durangite

Electron Density:

r_electron=3.65 gm/cc
note: r_Durangite=3.87 gm/cc.

Fermion Index

Fermion Index = 0.00014
Boson Index = 0.99986

Photoelectric:

PE_Durangite= 25.36 barns/electron
U=PE_Durangite x r_electron= 92.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Durangite is Not Radioactive

Durangite Classification

Dana Class:

41.5.5.2 (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.25-50 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 Durangite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Durangite :
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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Durangite

NaAl(AsO4)F
Dana No: 41.5.5.2 Strunz No: VII/B.25-50
Locality:

Notes: