Jedwabite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
Jacques Jedwab (1996)
Formula:
Fe7(Ta,Nb)3
Colour:
greyish yellow
Lustre:
Metallic
Hardness:
7
Specific Gravity:
8.91 (Calculated)
Crystal System:
Hexagonal
Name:
For Jacques Jedwab (May 7, 1925, Charleroi, Belgium - September 7, 2020, Brussels, Belgium), Université Libre de Bruxelles (ULB), Belgium, in recognition of his meticulous investigations of the mineralogy of placers and of carbides in natural environments.
This page provides mineralogical data about Jedwabite.
Unique Identifiers
Mindat ID:
7120
Long-form identifier:
mindat:1:1:7120:4
GUID
(UUID V4):
(UUID V4):
b52c9564-9aca-4fa2-9652-4685320638c9
IMA Classification of Jedwabite
Approved
IMA Formula:
Fe7Ta3
First published:
1997
Classification of Jedwabite
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
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
E : Iron-chromium family
1.1.34.1
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Jed | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Jedwabite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Jedwabite
Metallic
Transparency:
Opaque
Colour:
greyish yellow
Hardness:
7 on Mohs scale
Hardness:
VHN100=1100 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
8.91 g/cm3 (Calculated)
Optical Data of Jedwabite
Anisotropism:
none
Bireflectance:
None
Reflectivity:
| Wavelength | R |
|---|---|
| 420nm | 50.0% |
| 440nm | 52.6% |
| 460nm | 55.4% |
| 480nm | 55.3% |
| 500nm | 57.3% |
| 520nm | 59.0% |
| 560nm | 60.8% |
| 580nm | 62.4% |
| 600nm | 60.4% |
| 640nm | 61.9% |
| 660nm | 62.4% |
| 680nm | 62.2% |
| 700nm | 63.3% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 63.3%.
Colour in reflected light:
greyish white
Internal Reflections:
none
Chemistry of Jedwabite
Mindat Formula:
Fe7(Ta,Nb)3
Elements listed:
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 V:
157.69 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.19 Å | (70) |
| 2.05 Å | (100) |
| 2.01 Å | (60) |
| 1.347 Å | (80) |
| 1.059 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 26 : Hadean detrital minerals |
Type Occurrence of Jedwabite
General Appearance of Type Material:
Polycrystalline aggregates to 0.15 mm, or as 1–2 mm flattened hexagonal crystals with prism faces.
Place of Conservation of Type Material:
1) Fersman Mineralogical Museum, Moscow, Russia.
2) State Vernadski Geological Museum, Moscow, Russia
2) State Vernadski Geological Museum, Moscow, Russia
Reference:
Novgorodova, M.I., Generalov, M.E., Trubkin, N.V. (1997) Jedvabite Fe7(Ta,Nb)3 – a new mineral in paragenesic with tantal- and niobocarbides from Pt-bearing placers. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva: 126: 2: 100-104.
Synonyms of Jedwabite
Other Language Names for Jedwabite
Related Minerals - Strunz-mindat Grouping
| 1.AE. | Vanadium | V |
| 1.AE.05 | Molybdenum | Mo |
| 1.AE.05 | Chromium | Cr |
| 1.AE.05 | Iron | Fe |
| 1.AE.05 | Tungsten | W |
| 1.AE.05 | UM2001-06-E:CrFeNi | Fe7Cr2Ni |
| 1.AE.05 | Hexamolybdenum | (Mo,Ru,Fe,Ir,Os) |
| 1.AE.10 | Taenite | (Fe,Ni) |
| 1.AE.10 | Tetrataenite | FeNi |
| 1.AE.10 | Antitaenite | Fe3Ni |
| 1.AE.15 | Chromferide | Fe3Cr1-x (x=0.6) |
| 1.AE.15 | Ferchromide | Cr3Fe1-x |
| 1.AE.15 | Wairauite | CoFe |
| 1.AE.20 | Awaruite | Ni3Fe |
| 1.AE.30 | Manganese | Mn |
| 1.AE.35 | Nisnite | Ni3Sn |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Jedwabite
mindat.org URL:
https://www.mindat.org/min-7120.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Jedwabite
Localities for Jedwabite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Novgorodova et al. (1997) |
Quick NavTopUnique IdentifiersIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
