Ferchromide
| Ferchromide | |
|---|---|
| General and classification | |
| other names |
IMA 1984-022 |
| chemical formula | Cr 3 Fe 1 − x (x ~ 0.6) |
|
Mineral class (and possibly department) |
Elements - metals and intermetallic alloys |
|
System no. to Strunz and to Dana |
1.AE.15 ( 8th edition : I / A.06) 01.01.12.03 |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | m 3 m |
| Space group | Pm 3 m |
| Lattice parameters | a = 2.882 Å |
| Formula units | Z = 1 |
| Physical Properties | |
| Mohs hardness | 6.5 |
| Density (g / cm 3 ) | 6.18 |
| Cleavage | is missing |
| colour | gray-white metallic |
| Line color | Please complete |
| transparency | opaque |
| shine | Metallic luster |
| magnetism | ferromagnetic |
Ferchromide is a very rare mineral from the mineral class of elements, more precisely that of metals and intermetallic compounds . It crystallizes in the cubic crystal system with the chemical formula Cr 3 Fe 1 − x , where x is ~ 0.6. Ferchromide forms small, light-gray grains with a metallic sheen, which aggregate into aggregates a few hundred micrometers in size.
Special properties
Because of the iron it contains, the mineral is ferromagnetic .
Etymology and history
The mineral was first found in 1986 by MI Novgorodowa, AI Gorshkov, NW Trubkin, AI Tsepin and MT Dmitrieva in the type locality in the Urals . The name is derived from the elements iron and chromium involved, more precisely its Latin form ferrum .
classification
In the Strunz system, ferchromide is classified among metals and intermetallic compounds. While in the 8th edition it forms the chromium series (I / A.6) together with chromium, chromium feride , titanium and tungsten , it is classified differently from the ninth edition . There the mineral, together with chromium feride and wairauite, forms a subgroup of the iron-chromium group.
In the systematics of minerals according to Dana , it forms a group with the likewise cubic crystallizing minerals chromium and chromium feride.
Education and Locations
Ferchromide formed in quartz veins that are located in breccias of amphiboles or slate . It is associated with iron, copper , bismuth , gold , chromium feride , graphite , cohenite , halite , sylvin , marialite and quartz.
So far only one site is known, the type locality Kumak 110 kilometers east of Orsk in the southern Urals.
Crystal structure
Ferchromide crystallizes in the cubic crystal system in the space group with the lattice parameter a = 2.882 Å and one formula unit per unit cell .
See also
Individual evidence
- ↑ a b c d e f g h i j k FC Hawthorne et al .: New Mineral Names - Ferchromide . In: The American Mineralogist . tape 73 , 1988, pp. 191 ( PDF ).
- ^ List of minerals according to Dana at webmineral.com
- ↑ Localization of the location in mindat.org
literature
- Ferchromid in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf )