Erdite Mineral Data (original) (raw)

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

Click Here for Larger Erdite Image in a New Browser Window Images:

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 - PrismaticH-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),

Click Here for Large Erdite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Help on Above

| | Konnert J A , Evans H T , American Mineralogist , 65 (1980) p.516-521, The crystal structure of erdite, NaFeS2*2H2O | | ----------------------------------------------------------------------------------------------------------------------- |

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 R 2 ∑ 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

RelativeIntensity 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
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

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Ask about Erdite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

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: