Mineralogy Database

Durangite Mineral Data

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General Durangite Information

Help on Chemical  Formula: Chemical Formula: NaAl(AsO4)F
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: NaAl(AsO4)F
Help on Environment: Environment: Veins in alkalic rhyolite and tin placers derived therefrom. Forms two series, with maxwellite and with tilasite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1869
Help on Locality: Locality: Barranca tin mine, about 30 km northeast of Coneto de Comonfort, Durango, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for th locality.
Help on Name Pronunciation: Name Pronunciation: Durangite + Pronunciation Say DURANGITE
Help on Synonym: Synonym: ICSD 30205
  PDF 36-424

Durangite Image

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Comments: Equant red crystals of durangite with a dusting of white powder.
Location: Northern end Thomas Range, Juab County, Utah, USA. Scale: See Image.
© Rruff Database

Durangite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7719:1:0.8269
Help on Cell Dimensions: Cell Dimensions: a = 6.579, b = 8.523, c = 7.048, Z = 4; beta = 115.47° V = 356.79 Den(Calc)= 3.87
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 2 1) ( 1 1 1) ( 0 1 0) ( 1 1 1) ( 1 1 2) ( 1 1 0) ( 1 0 0)

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Physical Properties of Durangite

Help on Cleavage: Cleavage: {???} Indistinct, {110} Distinct
Help on Color: Color: Light yellow, Dark green, Orange red, Red.
Help on Density: Density: 3.9
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow

Optical Properties of Durangite

Help on Gladstone-Dale: 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
Ncalc = 1.67
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.65 gm/cc
note: Specific Gravity of Durangite =3.87 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001477657
Boson Index = 0.9998522343
Help on Photoelectric: Photoelectric: PEDurangite = 25.36 barns/electron
U=PEDurangite x rElectron Density= 92.53 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Durangite is Not Radioactive

Durangite 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 Durangite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Durangite :
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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