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Howardevansite Mineral Data

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General Howardevansite Information

Help on Chemical  Formula: Chemical Formula: NaCu++Fe+++2(VO4)3
Help on Composition: Composition: Molecular Weight = 543.05 gm
   Sodium     4.23 %  Na    5.71 % Na2O
   Vanadium  28.14 %  V    50.24 % V2O5
   Iron      20.57 %  Fe   29.41 % Fe2O3
   Copper    11.70 %  Cu   14.65 % CuO
   Oxygen    35.35 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCuFe3+2(VO4)3
Help on Environment: Environment: Forms by sublimation around furaroles on an andesitic volcano.
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: Locality: Izalco volcano, El Salvador. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Howard Tasker Evans, Jr. (1919-2000), American mineralogist and crystallographer, U.S.G.S., Reston, Virginia, USA.
Help on Name Pronunciation: Name Pronunciation: Howardevansite + Pronunciation Say HOWARDEVANSITE
Help on Synonym: Synonym: ICSD 202529
  PDF 42-1333
 

Howardevansite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8388:1:0.6805
Help on Cell Dimensions: Cell Dimensions: a = 8.198, b = 9.773, c = 6.651, Z = 2; alpha = 103.82°, beta = 101.99°, gamma = 106.74° V = 484.71 Den(Calc)= 3.72
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.093(1), 3.167(1), 1.659(0.7),
 

Physical Properties of Howardevansite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Opaque to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luster: Luster: Metallic
Help on Streak: Streak: red brown
 

Optical Properties of Howardevansite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 2.14 - from Gladstone-Dale relationship (KC = 0.2992) where Ncalc=Dcalc*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Moderate.
Help on RL Color: RL Color: Medium gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Howardevansite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 481 nm   15.50   20.10 
   
 547 nm   15.00   18.40 
 591 nm   14.10   17.20 
 644 nm   13.50   17.10 
Calculated Relative Intensity Colors of Howardevansite in Air
Relative
Intensity
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630%
R1                      
R2                      
 

Calculated Properties of Howardevansite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.61 gm/cc
note: Specific Gravity of Howardevansite =3.81 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0052336727
Boson Index = 0.9947663273
Help on Photoelectric: Photoelectric: PEHowardevansite = 17.05 barns/electron
U=PEHowardevansite x rElectron Density= 61.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Howardevansite is Not Radioactive
 

Howardevansite Classification

Help on  Dana Class: Dana Class: 38.05.03.01 (38)Anhydrous Phosphates, etc
  (38.05)with miscellaneous formulae
  (38.05.03)Dana Group
 
38.05.03.01 Howardevansite NaCuFe2(VO4)3 P1 1
Help on  Strunz Class: Strunz Class: 08.AC.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
 
08.AC.05 Howardevansite NaCuFe2(VO4)3 P1 1
 

Other Howardevansite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.73,p181-186,1988) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Howardevansite :
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
15 - WWW-MINCRYST

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

Howardevansite

NaCu++Fe+++2(VO4)3
Dana No: 38.05.03.01 Strunz No: 08.AC.05
Locality:

 

Notes:

 

 
   
 


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