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Erdite Mineral Data

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General Erdite Information

Help on Chemical  Formula: Chemical Formula: NaFeS2•2(H2O)
Help on Composition: Composition: Molecular Weight = 179.00 gm
   Sodium    12.84 %  Na
   Iron      31.20 %  Fe
   Hydrogen   2.25 %  H
   Sulfur    35.83 %  S
   Oxygen    17.88 %  O
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: NaFe2+S2•2(H2O)
Help on Environment: Environment: Found in abundance, typically with other sulfides and fine grained magnetite, in discrete, late segregations within a mafic alkalic diatreme.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Coyote Peak diatreme, 16 miles SW of Orick, Humboldt Co. California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Richard C. Erd (1924- ), mineralogist with the U.S. Geological Survey.
Help on Name Pronunciation: Name Pronunciation: Erdite Say ERDITE
Help on Synonym: Synonym: ICSD 100181
  PDF 33-1253
 

Erdite Image

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  Erdite

Comments: Red-brown columnar crystalline erdite in matrix.
Location: Coyote Peak, Humboldt County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Erdite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1731:1:0.6041
Help on Cell Dimensions: Cell Dimensions: a = 10.693, b = 9.115, c = 5.507, Z = 4; beta = 92.17° V = 536.36 Den(Calc)= 2.22
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.935(1), 5.342(0.71), 4.556(0.41),
 

Physical Properties of Erdite

Help on Cleavage: Cleavage: {110} Good
Help on Color: Color: Copper red, Red, Black.
Help on Density: Density: 2.3
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Metallic
Help on Streak: Streak: black
 

Optical Properties of Erdite

Help on RL Pleochroism: RL Pleochroism: Extreme, brilliant reddish orange though greenish grays and pinkish grays to dark gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Erdite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 440 nm    6.60   15.30 
   
 460 nm    6.80   15.80 
 480 nm    7.00   13.50 
 500 nm    7.40   11.70 
 520 nm    7.60   11.70 
 540 nm    8.50   19.40 
 560 nm    8.80   20.70 
 580 nm    8.80   22.80 
 600 nm    8.70   26.70 
 620 nm    9.60   31.10 
 640 nm    9.90   34.70 
 660 nm   10.00   34.50 
 680 nm    9.90   30.40 
 700 nm    9.90   36.50 
Calculated Relative Intensity Colors of Erdite in Air
Relative
Intensity
   0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000%
R1                      
R2                      
 

Calculated Properties of Erdite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.21 gm/cc
note: Specific Gravity of Erdite =2.22 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0093905972
Boson Index = 0.9906094028
Help on Photoelectric: Photoelectric: PEErdite = 11.26 barns/electron
U=PEErdite x rElectron Density= 24.86 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Erdite is Not Radioactive
 

Erdite Classification

Help on  Dana Class: Dana Class: 02.14.05.01 (02)Sulfides - Including Selenides and Tellurides
  (02.14)(Hydroxyl or Hydrated)
  (02.14.05)Dana Group
 
02.14.05.01 Erdite NaFeS2•2(H2O) C 2/c 2/m
Help on  Strunz Class: Strunz Class: 02.FD.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O
  02.FD -With O, OH, H2O
 
02.FD.20 Erdite NaFeS2•2(H2O) C 2/c 2/m
 

Other Erdite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Erdite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Erdite

NaFeS2•2(H2O)
Dana No: 02.14.05.01 Strunz No: 02.FD.20
Locality:

 

Notes:

 

 
   
 


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