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Erdite

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About ErditeHide

R. Erd, G. Foord and E. Oyler
Formula:
NaFeS2 · 2H2O
Colour:
Copper-red
Lustre:
Metallic
Hardness:
2
Specific Gravity:
2.30
Crystal System:
Monoclinic
Name:
Named by G.K. Czamanske, B.F. Leonard, J.R. Clark in 1980 in honor of Richard Clarkson "Dick" Erd (29 February 1924, Lexington, Kentucky, USA - 20 May 2008, Springdale, Arkansas, USA), mineralogist with the US Geological Survey. He had previously synthesized the substance in 1956.
This page provides mineralogical data about Erdite.


Classification of ErditeHide

Approved
Approval Year:
1978
First Published:
1980
2.FD.20

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
D : With O, OH, H2O
Dana 7th ed.:
2.14.5.1
2.14.5.1

2 : SULFIDES
14 : Hydroxysulfides and Hydrated Sulfides
3.0.1

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
0 : Sulphides etc. of the alkalis

Pronounciation of ErditeHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of ErditeHide

Metallic
Transparency:
Opaque
Colour:
Copper-red
Comment:
Tarnishes quickly
Streak:
Black
Hardness:
Hardness:
VHN15=22 - 67 kg/mm2 - Vickers
Cleavage:
Distinct/Good
{110} Good
Density:
2.30 g/cm3 (Measured)    2.216 g/cm3 (Calculated)
Comment:
Measured contaminated with magnetite

Chemical Properties of ErditeHide

Formula:
NaFeS2 · 2H2O
Common Impurities:
K

Crystallography of ErditeHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 10.693 Å, b = 9.115 Å, c = 5.507 Å
β = 92.17°
Ratio:
a:b:c = 1.173 : 1 : 0.604
Unit Cell V:
536.36 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Minute fibers, fine bladed crystals to 1mm long.

Type Occurrence of ErditeHide

Synonyms of ErditeHide

Other Language Names for ErditeHide

German:Erdit
Russian:Эрдит
Spanish:Erdita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Martinite2 photos of Erdite associated with Martinite on mindat.org.
Coyoteite1 photo of Erdite associated with Coyoteite on mindat.org.
Rasvumite1 photo of Erdite associated with Rasvumite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.FD.UKI-2004-(OS:BiCuPb)PbCu4Bi4S2O16 (?)Tet.
2.FD.05KermesiteSb2S2OTric. 1 : P1
2.FD.10Viaeneite(Fe,Pb)4S8OMon.
2.FD.25CoyoteiteNaFe3S5 · 2H2OTric.
2.FD.30Haapalaite(Fe2+,Ni)2(Mg,Fe2+)1.61S2(OH)3.22Hex.
2.FD.30Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6Hex.
2.FD.30Yushkinite(Mg,Al)V4+S2(OH)2Hex.
2.FD.35TochiliniteFe2+5-6(Mg,Fe2+)5S6(OH)10
2.FD.40WilhelmramsayiteCu3FeS3·2H2OOrth. mmm (2/m 2/m 2/m) : Pmmm
2.FD.45VyalsoviteFeCaAlS(OH)5Orth.
2.FD.50BazhenoviteCa8S2(S3)(S2O3)(OH)12 · 20H2OMon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.0.2CoyoteiteNaFe3S5 · 2H2OTric.
3.0.3ChvilevaiteNa(Cu,Fe,Zn)2S4Trig. 3m : R3m
3.0.4RasvumiteKFe2S3Orth. mmm (2/m 2/m 2/m) : Cmcm
3.0.5BartoniteK6Fe20S26STet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.0.6MurunskiteK2(Cu,Fe)4S4Tet.

Other InformationHide

Thermal Behaviour:
When heated in a closed tube, it gives off water, sulfur and eventually turns black and strongly magnetic.
Notes:
Easily soluble in cold dilute acids with effervescence of H2S.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ErditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Czamanske, G.K., Leonard, B.F., Clark, J.R. (1980) Erdite, a new hydrated sodium iron sulfide mineral. American Mineralogist: 65: 509-515.
Konnert, J.A., Evans, H.T. (1980) The crystal structure of erdite, NaFeS2•2H2O. American Mineralogist: 65: 516-521.

Internet Links for ErditeHide

Localities for ErditeHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.; Pekov, I. et al (2003): New Data on Minerals: 38: 20-33.
      • Lajemmerais RCM
        • Varennes & St-Amable
HORVÁTH, L., PFENNINGER HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83 118.
Horváth, L., Pfenninger-Horváth, E., Gault, R. A., & Tarassoff, P. (1998): Mineralogy of the Saint-Amable Sill, Varennes and Saint-Amable, Québec. Mineralogical Record, 29: 83-118.
Russia
 
  • Northern Region
    • Murmanskaya Oblast'
      • Lovozero Massif
[World of Stones 95:5-6, p64]
USA (TL)
 
  • California
    • Humboldt Co.
      • Coastal Range
Czamanske, G.K., B.F. Leonard & J.R. Clark (1980), Erdite, a new hydrated sodium iron sulfide mineral: American Mineralogist: 65: 506-515; Konnert, J.A. and Evans, H.T. (1980) The crystal structure of erdite, NaFeS2 •2H2O. American Mineralogist: 65: 516-521; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 67, 367; American Mineralogist: (1983) 68: 245-254.
Mineral and/or Locality  
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