Jedwabit
| Jedwabit | |
|---|---|
| General and classification | |
| other names |
IMA 1995-043 |
| chemical formula | Fe 7 (Ta, Nb) 3 |
|
Mineral class (and possibly department) |
Elements - metals and intermetallic alloys |
|
System no. to Strunz and to Dana |
1.AE.25 ( 8th edition : I / A.08) 01.01.24.01 |
| Crystallographic Data | |
| Crystal system | hexagonal |
| Crystal class ; symbol | 6 mm , 6 m 2 or 6 / mmm |
| Space group | P 6 3 mc , P 6 2 c or P 6 3 / mmc |
| Lattice parameters | a = 4.81 Å ; c = 7.87 Å Please complete the source as an individual reference |
| Formula units | Z = 1 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | 6.5 |
| Density (g / cm 3 ) | 8.91 |
| Cleavage | is missing |
| colour | grey yellow |
| Line color | Please complete |
| transparency | opaque |
| shine | metallic |
Jedwabit is a very rare mineral from the mineral class of elements, more precisely metals and intermetallic compounds . It crystallizes in the hexagonal crystal system with the chemical composition Fe 7 (Ta, Nb) 3 and forms polycrystalline aggregates up to 0.15 mm in size or flat, 1–2 μm large hexagonal crystals.
Etymology and history
Jedwabit was first found in 1997 by MI Novgorodova, ME Generalov and NV Trubkin in the type locality , on the Aktai River near Nizhny Tagil in the central Urals ( Russia ). It was named after the Belgian mineralogist J. Jedwab.
classification
In the Strunz system , Jedwabit is counted among the metals and intermetallic compounds, a subgroup of the elements. After the 8th edition, it forms a group together with Awaruit , Nickel , Taenit and Tetrataenit . In the 9th edition , it forms a separate subgroup of the iron- chromium family.
In the Dana system , it forms a separate subgroup of the metallic elements apart from the platinum metals .
Education and Locations
Apart from the type locality, no other finds are known.
Crystal structure
Jedwabit crystallizes in the hexagonal crystal system in the space group P6 3 mc, or P6 3 / mmc with the lattice parameters a = 4.81 Å and c = 7.87 Å and one formula unit per unit cell .
See also
Individual evidence
literature
- MI Novgorodova, ME Generalov, NV Trubkin: Jedwabite Fe 7 (Ta, Nb) 3 — a new mineral in paragenesis with tantalum and niobium carbides from platinum bearing placers . In: Zapiski Vseross. Mineral. Obshch ., 1997, 126, 2, pp. 100-103 (Russian). Abstract in: American Mineralogist , 1989, 83, p. 654 (engl., Pdf ).