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Erdite Mineral Data
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General Erdite Information
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 Chemical Formula: |
NaFeS2•2(H2O) |
| Composition: |
Molecular Weight = 179.00 gm |
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Sodium 12.84 % Na |
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Iron 31.20 % Fe |
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Hydrogen 2.25 % H |
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Sulfur 35.83 % S |
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Oxygen 17.88 % O |
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______ |
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100.00 % |
| Empirical Formula: |
NaFe2+S2•2(H2O) |
| Environment: |
Found in abundance, typically with other sulfides and fine grained magnetite, in discrete, late segregations within a mafic alkalic diatreme. |
| IMA Status: |
Approved IMA 1977 |
| Locality: |
Coyote Peak diatreme, 16 miles SW of Orick, Humboldt Co. California. Link to MinDat.org Location Data. |
| Name Origin: |
For Richard C. Erd (1924- ), mineralogist with the U.S. Geological Survey. |
| Name Pronunciation: |
Erdite  |
| Synonym: |
ICSD 100181 |
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PDF 33-1253 |
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Erdite Image |
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Images:
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Erdite Crystallography
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| Axial Ratios: |
a:b:c =1.1731:1:0.6041 |
| Cell Dimensions: |
a = 10.693, b = 9.115, c = 5.507, Z = 4; beta = 92.17° V = 536.36 Den(Calc)= 2.22 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c |
| X Ray Diffraction: |
By Intensity(I/Io): 6.935(1), 5.342(0.71), 4.556(0.41), |
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Physical Properties of Erdite
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| Cleavage: |
{110} Good |
| Color: |
Copper red, Red, Black. |
| Density: |
2.3 |
| Diaphaneity: |
Opaque |
| Hardness: |
2 - Gypsum |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Erdite
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| RL Pleochroism: |
Extreme, brilliant reddish orange though greenish grays and pinkish grays to dark gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Erdite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 440 nm |
6.60 |
15.30 |
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| 460 nm |
6.80 |
15.80 |
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| 480 nm |
7.00 |
13.50 |
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| 500 nm |
7.40 |
11.70 |
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| 520 nm |
7.60 |
11.70 |
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| 540 nm |
8.50 |
19.40 |
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| 560 nm |
8.80 |
20.70 |
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| 580 nm |
8.80 |
22.80 |
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| 600 nm |
8.70 |
26.70 |
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| 620 nm |
9.60 |
31.10 |
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| 640 nm |
9.90 |
34.70 |
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| 660 nm |
10.00 |
34.50 |
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| 680 nm |
9.90 |
30.40 |
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| 700 nm |
9.90 |
36.50 |
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Calculated Relative Intensity Colors of Erdite in Air
Relative
Intensity |
0% |
100% |
200% |
300% |
400% |
500% |
600% |
700% |
800% |
900% |
1000% |
| R1 |
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| R2 |
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Calculated Properties of Erdite
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| Electron Density: |
Bulk Density (Electron Density)=2.21 gm/cc
note: Specific Gravity of Erdite =2.22 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0093905972
Boson Index = 0.9906094028 |
| Photoelectric: |
PEErdite = 11.26 barns/electron
U=PEErdite x rElectron Density= 24.86 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Erdite is Not Radioactive |
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Erdite Classification
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| Dana Class: |
02.14.05.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.14)(Hydroxyl or Hydrated) |
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(02.14.05)Dana Group |
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02.14.05.01 Erdite NaFeS2•2(H2O) C 2/c 2/m |
| Strunz Class: |
02.FD.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O |
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02.FD -With O, OH, H2O |
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02.FD.20 Erdite NaFeS2•2(H2O) C 2/c 2/m |
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Other Erdite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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 :
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Erdite
NaFeS2•2(H2O)
Dana No: 02.14.05.01 Strunz No: 02.FD.20
Locality:
Notes:
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