Haxonite
| Haxonite | |
|---|---|
| General and classification | |
| other names |
IMA 1971-001 |
| chemical formula | (Fe, Ni) 23 C 6 |
|
Mineral class (and possibly department) |
Elements - metals, alloys, intermetallic compounds |
|
System no. to Strunz and to Dana |
1.BA.10 ( 8th edition : I / A.09) 01.01.16.02 |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | cubic hexakisoctahedral; 4 / m 3 2 / m |
| Space group | Fm 3 m (No. 225) |
| Lattice parameters | a = 10.55 Å |
| Formula units | Z = 4 |
| Physical Properties | |
| Mohs hardness | 5.5 to 6 |
| Density (g / cm 3 ) | calculated: 7.70 |
| Cleavage | is missing |
| colour | silvery, tin white |
| Line color | dark gray |
| transparency | opaque |
| shine | Metallic luster |
| Crystal optics | |
| Birefringence | none, optically isotropic |
| Other properties | |
| Special features | unstable under terrestrial conditions |
Haxonite is a very rarely occurring meteoritic mineral from the mineral class of "element minerals". It crystallizes in a cubic crystal system with the composition (Fe, Ni) 23 C 6 , so it is chemically an iron - nickel - carbide . The elements indicated in the round brackets can represent each other in the formula ( substitution , diadochie), but are always in the same proportion to the other components of the mineral.
Haxonite is also opaque in thin layers and develops only microscopic crystallites in massive aggregates of silver to pewter-white color and metallic sheen .
Etymology and history
Haxonite was named after the English metallurgist Howard J. Axon (1924-1992). The mineral was described in 1971 by ERD Scott, who was able to detect it in the Mexican Toluca meteorite and in the US Canyon Diablo meteorite . Both meteorites are therefore also considered a type locality for this mineral.
classification
In the meantime outdated, but still in use 8th edition of the mineral classification by Strunz of haxonite belonged to the department of " metals , alloys and intermetallic compounds " where he along with cohenite , Hongquiit , Isovit , Khamrabaevit , Niobocarbid , tantalum and Tongbait the unnamed group I / A.09 formed.
In contrast , the 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), classifies the haxonite in the newly defined division of “Metallic carbon, nitrogen and phosphorus compounds”. This division, however, is further divided after the connection characterizing connection Spartans, so that the mineral according to its composition in the subdivision of " Carbide is" to find where it along with Isovit the unnamed group 1.BA.10 forms.
The systematics of minerals according to Dana , which is mainly used in the English-speaking area , also assigns the Haxonite to the class of "element minerals" and there in the department of the same name. Here it can be found together with Cohenit and Isovit in the unnamed group 01.01.16 within the sub-section "Elements: Metallic elements other than the platinum group".
Crystal structure
Haxonite crystallizes cubically in the space group Fm 3 m (space group no. 225) with the lattice parameter a = 10.55 Å and 4 formula units per unit cell .
properties
Like cohenite , haxonite is unstable under terrestrial conditions and very slowly breaks down into the minerals kamacite and graphite .
Education and Locations
Haxonite is a component of iron meteorites . As Begleitminerale occur among other Kamacite , taenite , schreibersite , cohenite, pentlandite and magnetite on.
The mineral was found in other meteorites such as the Xinjiang iron meteorite in China, the Nagyvázsony meteorite in the Hungarian Bakony forest and the Edmonton , Tazewell and the Deport meteorite ( Red River County ) in the USA.
See also
literature
- Friedrich Klockmann : Klockmann's textbook of mineralogy . Ed .: Paul Ramdohr , Hugo Strunz . 16th edition. Enke , Stuttgart 1978, ISBN 3-432-82986-8 , pp. 398 (first edition: 1891).
- Michael Fleischer : New mineral names - Haxonite , in: American Mineralogist , Volume 59 (1974), pp. 208–212 ( PDF 559.7 kB ; p. 5)
Web links
- Mineral Atlas: Haxonite (Wiki)
- Web mineral - Haxonite
- Database-of-Raman-spectroscopy - Haxonite (English)
Individual evidence
- ^ A b c Hugo Strunz , Ernest H. Nickel : Strunz Mineralogical Tables. Chemical-structural Mineral Classification System . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 46 .
- ↑ Haxonite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 ( handbookofmineralogy.org [PDF; 65 kB ; accessed on April 14, 2018]).
- ↑ Jacques Lapaire: Mineral Database - Minéraux et étymologie ( Memento from July 30, 2012 in the web archive archive.today )
- ↑ Mindat - Haxonite