Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Erdite

This page is currently not sponsored. Click here to sponsor this page.
Big Photo

Coyote Peak, Coastal Range, Humboldt Co., California, USA
© 2008, JGW

Show Erdite Photos (7)



Formula:
NaFeS
 
2
 · 2H
 
2
O
System:MonoclinicColour:Copper-red
Lustre:MetallicHardness:2
Name:
For Richard C. Erd (1924-), mineralogist USGS
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
mindat.org URL:http://www.mindat.org/min-1394.html
Please feel free to link to this page.

Type Occurrence of Erdite

Type Locality:Coyote Peak, Coastal Range, Humboldt Co., California, USA
Year of Discovery:1980
Geological Setting of type material:In mafic, alkalic diatreme

Occurrences of Erdite

Geological Setting:Pegmatites in nepheline syenite

Physical Properties of Erdite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Copper-red
Comment:Tarnishes quickly
Streak:Black
Hardness (Mohs):2
Hardness (Vickers):VHN15=22 - 67 kg/mm2
Cleavage:Distinct/Good
{110} Good
Density (measured):2.30 g/cm3
Density (calculated):2.216 g/cm3
Comment:Measured contaminated with magnetite

Crystallography of Erdite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Space Group Setting:C2/c
Cell Parameters:a = 10.693Å, b = 9.115Å, c = 5.507Å
β = 92.17°
Ratio:a:b:c = 1.173 : 1 : 0.604
Unit Cell Volume:V 536.36 ų (Calculated from Unit Cell)
Z:4
Morphology:Minute fibers, fine bladed crystals to 1mm long.

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.UKI-2004-(OS:BiCuPb)
PbCu
 
4
Bi
 
4
S
 
2
O
 
16
 (?)
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
S
 
2
(OH)
 
3.22
2.FD.30Valleriite
(Fe
2+
 
,Cu)
 
4
(Mg,Al)
 
3
S
 
4
(OH,O)
 
6
2.FD.30Yushkinite
(Mg,Al)V
4+
 
S
 
2
(OH)
 
2
2.FD.35Tochilinite
Fe
2+
5-6
(Mg,Fe
2+
 
)
 
5
S
 
6
(OH)
 
10
2.FD.40Wilhelmramsayite
Cu
 
3
FeS
 
3
·2H
 
2
O
2.FD.45Vyalsovite
FeCaAlS(OH)
 
5
2.FD.50Bazhenovite
Ca
 
8
S
 
2
(S
 
3
)(S
 
2
O
 
3
)(OH)
 
12
 · 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,Fe)
 
4
S
 
4

Other Names for Erdite

Synonyms:
IMA1977-048
Other Languages:
German:Erdit
Russian:Эрдит
Spanish: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.

Internet Links for Erdite

Search Engines:
  • Look for Erdite on Google
  • Look for Erdite images on Google
    • External Links:
  • Look for Erdite on Webmineral
  • Look for Erdite on Athena Mineralogy
  • Look for Erdite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Erdite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Search for Erdite from all mineral dealers at minfind.com
  • Buy RARE Minerals from Rocks of Africa
  • By minerals from YourMineralCollection
  • Search for - Erdite - on e-Rocks Mineral Sales & Auctions
  • High-end worldwide specimens & outstanding customer service
  • Rare and Unusual minerals at Mineralogical Research Company
  • The Arkenstone - Fine Minerals
  • Wilensky Fine Minerals
  • Search for minerals at Heliodor
  • SpiriferMinerals.com - high quality low prices
  • Find Erdite on www.crystalclassics.co.uk
  • Edwards Minerals - Fine Specimens
    • Jobs:
  • Mining & Geology Jobs

    • Localities for Erdite

    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.
    Hide Locality List
    (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
      • Montérégie
        • Lajemmerais RCM
          • Varennes & St-Amable
            • Saint-Amable sill
    		Mineralogical Record: 29: 83.
        • Rouville 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.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Lovozero Massif
    		[World of Stones 95:5-6, p64]
    USA
     
    • 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
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: 6th Sep 2011 17:32:43
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds