Wairauit
| Wairauit | |
|---|---|
| General and classification | |
| other names |
IMA 1964-015 |
| chemical formula | CoFe |
|
Mineral class (and possibly department) |
Elements - metals and intermetallic alloys |
|
System no. to Strunz and to Dana |
1.AE.15 ( 8th edition : I / A.07) 01.01.11.06 |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | Please complete |
| Lattice parameters | a = 2.86 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 | 5 |
| Density (g / cm 3 ) | 8.32 |
| Cleavage | Please complete |
| colour | steel gray metallic |
| Line color | Please complete |
| transparency | opaque |
| shine | metallic |
Wairauite is a very rare mineral from the mineral class of the elements, more precisely the metals and intermetallic compounds . It crystallizes in the cubic crystal system with the chemical composition CoFe and forms idiomorphic , cubic or octahedral grains up to 7 · 4 μm in size. The mineral is very magnetic .
Etymology and history
Wairauit was first found in 1965 by GA Challis and JVP Long in the type locality , the valley of the Wairau River on New Zealand's South Island . It is named after this too.
classification
In the Strunz system , Wairauit is counted among the metals and intermetallic compounds, a subgroup of the elements. After the 8th edition it forms a group together with iron , kamacite and manganese . In the 9th edition it forms a subgroup of the iron- chromium family with chromium feride and ferchromide .
In the Dana systematics , with iron, kamacite, taenite , tetrataenite , avaruit and nickel, it forms a subgroup (iron-nickel group) of the metallic elements apart from the platinum metals .
Education and Locations
Wairauite is formed in lizardite during serpentinization under reducing , low-sulfur conditions . It is associated with chromite , magnetite , awaruit and copper .
In addition to the type locality, finds from the Canadian provinces of Northwest Territories and British Columbia , Ningqiang in the Chinese province of Shaanxi , Balangero in the metropolitan city of Turin ( Italy ), the prefecture of Ehime in Japan , Bashkortostan in Russia and the US state of Oregon are known.
Crystal structure
Wairauit crystallizes in the cubic crystal system with the lattice parameter a = 2.86 Å and one formula units per unit cell . The exact space group is not known.
See also
literature
- Wairauit . In: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( PDF ).
- GA Challis and JVP Long: Wairauite - a new cobalt-iron mineral. In: Mineralogical Magazine , 1964, 33, p. 942. Abstract in: American Mineralogist. 1965, 50, p. 521 (English, PDF ).
Web links
- Mineral Atlas: Wairauit
- Wairauite at mindat.org