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Jedwabite

Formula:
Fe
 
7
(Ta,Nb)
 
3
System:HexagonalColour:grayish yellow
Lustre:MetallicHardness:7
Name:For Jacques Jedwab, Université Libre de Bruxelles, Belgique, in recognition of his meticulous investigations of the mineralogy of placers and of carbides in natural environments.
This page provides mineralogical data about Jedwabite.

Classification of Jedwabite

IMA status:Approved
Strunz 8th edition ID:1/A.08-50
Nickel-Strunz 10th (pending) edition ID:1.AE.25

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
E : Iron-chromium family
Dana 8th edition ID:1.1.34.1

1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
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Type Occurrence of Jedwabite

Type Locality:Avrorinskii Placer, Aktai River, Baranchinsky Massif, Nizhnii Tagil, Ekaterinburgskaya (Sverdlovskaya) Oblast', Middle Urals, Urals Region, Russia

Physical Properties of Jedwabite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:grayish yellow
Hardness (Mohs):7
Hardness (Vickers):VHN100=1100 kg/mm2
Cleavage:None Observed
Fracture:Irregular/Uneven
Density (calculated):8.91 g/cm3

Crystallography of Jedwabite

Crystal System:Hexagonal
Class (H-M):6mm - Dihexagonal Pyramidal
Space Group:P63mc
Cell Parameters:a = 4.81(2) Å, c = 7.87(2) Å
Ratio:a:c = 1 : 1.636
Unit Cell Volume:V 157.69 ų (Calculated from Unit Cell)
Z:1
X-Ray Powder Diffraction:
d-spacingIntensity
2.19 (70)
2.05 (100)
2.01 (60)
1.347 (80)

Chemical Properties of Jedwabite

Formula:
Fe
 
7
(Ta,Nb)
 
3
Essential elements:Fe, Ta
All elements listed in formula:Fe, Nb, Ta

Relationship of Jedwabite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
1.AE.05Molybdenum
Mo
1.AE.05Chromium
Cr
1.AE.05Iron
Fe
1.AE.05Kamacite
(Fe,Ni)
1.AE.05Tungsten
W
1.AE.05UM2001-06-E:CrFeNi
Fe
 
7
Cr
 
2
Ni
1.AE.10Taenite
(Fe,Ni)
1.AE.10Tetrataenite
FeNi
1.AE.10Antitaenite
Fe
 
3
Ni
1.AE.15Chromferide
Fe
 
3
Cr
 
1-x
 (x=0.6)
1.AE.15Ferchromide
Cr
 
1.5
Fe
 
0.5-x
1.AE.15Wairauite
CoFe
1.AE.20Awaruite
Ni
 
3
Fe
1.AE.30Manganese
Mn

Other Names for Jedwabite

Synonyms:
IMA1995-043Jedvabite
Other Languages:
German:Jedvabit
Jedwabit
Spanish:Jedvabita
Jedwabita

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 Jedwabite

Reference List:Mineralogical Record: 29: 472.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1997): 126(2): 100-104.[Am. Min. 83: 654(1998)(abstract)]

Internet Links for Jedwabite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Jedwabite details from Handbook of Mineralogy (PDF)
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    Localities for Jedwabite

    (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.
    Russia
     
    • Urals Region
      • Middle Urals
        • Ekaterinburgskaya (Sverdlovskaya) Oblast'
          • Nizhnii Tagil
            • Baranchinsky Massif
              • Aktai River
    		[MinRec 32:472]
    Mineral and/or Locality
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