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Erdite

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Coyote Peak, Orick, Humboldt Co., California, USA
© 2005 M. Kampf

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Formula:
NaFeS
 
2
·2H
 
2
O
System:MonoclinicColour:Copper-red
Lustre:MetallicHardness:2
This page provides mineralogical data about Erdite.

Classification of Erdite

IMA status:Approved
Strunz 8th edition ID:2/F.09-10
Nickel-Strunz 10th (pending) edition ID: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 edition ID:2.14.5.1
Dana 8th edition ID:2.14.5.1

2 : SULFIDES
14 : Hydroxysulfides and Hydrated Sulfides
Hey's CIM Ref.: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
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Type Occurrence of Erdite

Type Locality:Coyote Peak, Orick, Humboldt Co., California, USA
Year of Discovery:1980

Physical Properties of Erdite

Lustre:Metallic
Colour:Copper-red
Streak:Black
Hardness (Mohs):2

Crystallography of Erdite

Crystal System:Monoclinic
Cell Parameters:a = 10.69Å, b = 9.11Å, c = 5.5Å
β = 92.17°
Ratio:a:b:c = 1.173 : 1 : 0.604
Unit Cell Volume:V 535.24 ų (Calculated from Unit Cell)

Chemical Properties of Erdite

Formula:
NaFeS
 
2
·2H
 
2
O
Essential elements:Fe, H, Na, O, S
All elements listed in formula:Fe, H, Na, O, S
Common Impurities:K

Relationship of Erdite to other Species

Related Minerals - Nickel-Strunz Grouping):
2.FD.05Kermesite
Sb
 
2
S
 
2
O
2.FD.10Viaeneite
(Fe,Pb)
 
4
S
 
8
O
2.FD.25Coyoteite
NaFe
 
3
S
 
5
·2H
 
2
O
2.FD.30Haapalaite
(Fe
2+
 
,Ni)
 
2
(Mg,Fe
2+
 
)
 
1.61
[(OH)
 
3.22
|S
 
2
]
2.FD.30Valleriite
(Fe
2+
 
,Cu)
 
4
(Mg,Al)
 
3
[(OH,O)
 
6
|S
 
4
]
2.FD.30Yushkinite
V
 
<1
(Mg,Al)
 
n
[(OH,O)
 
2n
|S]
2.FD.35Tochilinite
Fe
2+
5-6
(Mg,Fe
2+
 
)
 
5
[(OH)
 
10
|S
 
6
]
2.FD.40Wilhelmramsayite
Cu
 
3
FeS
 
3
·2H
 
2
O
2.FD.45Vyalsovite
FeCaAl[(OH)
 
5
|S]
2.FD.50Bazhenovite
Ca
 
8
[(OH)
 
12
|S
 
2
O
 
3
|S
 
5
] · 20H
 
2
O
Related Minerals - Hey's Index Grouping:
3.0.2Coyoteite
NaFe
 
3
S
 
5
·2H
 
2
O
3.0.3Chvilevaite
Na(Cu,Fe,Zn)
 
2
S
 
4
3.0.4Rasvumite
KFe
 
2
S
 
3
3.0.5Bartonite
K
 
3
Fe
 
10
S
 
14
3.0.6Murunskite
K
 
2
Cu
 
3
FeS
 
4

Other Names for Erdite

Synonyms:
IMA1977-048
German names:
Erdit
Russian names:
Эрдит
Spanish names:
Erdita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Erdite

Reference List:Czamanske, G.K., B.F. Leonard & J.R. Clark (1980), Erdite, a new hydrated sodium iron sulfide mineral: American Mineralogist: 65: 509-515.

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

Articles/Blogs about Erdite

Internet Links for Erdite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Erdite in the Natural History Museum (London) online catalogue
  • Erdite details from Handbook of Mineralogy (PDF)
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    Localities for Erdite

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    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Québec
      • Rouville Co.
        • Mont Saint-Hilaire
    		Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
      • Verchères Co.
        • Varennes & St-Amable
          • Saint-Amable sill
    		Mineralogical Record: 29: 83.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Lovozero Massif
    		[World of Stones 95:5-6, p64]
    USA
     
    • California
      • Humboldt Co.
        • Orick
    		No reference listed
    Mineral and/or Locality
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