Agility
| Agility | |
|---|---|
| General and classification | |
| other names |
IMA 2003-014 |
| chemical formula | Fe 2 Si |
|
Mineral class (and possibly department) |
Elements - metals, alloys, intermetallic compounds |
|
System no. to Strunz and to Dana |
1.BB.05 ( 8th edition : I / A.12) 01.01.23.04 |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | cubic-hexakisoctahedral 4 / m 3 2 / m |
| Room group (no.) | Pm 3 m (No. 221) |
| Lattice parameters | a = 2.831 Å |
| Formula units | Z = 1 |
| Physical Properties | |
| Mohs hardness | Please complete |
| Density (g / cm 3 ) | 6.47 |
| Cleavage | Please complete |
| colour | silvery, white-yellow |
| Line color | Please complete |
| transparency | opaque |
| shine | Metallic luster |
| Crystal optics | |
| Pleochroism | unavailable |
Hapkeit is a very rarely occurring mineral from the mineral class of the "elements". It crystallizes in the cubic crystal system with the composition Fe 2 Si is thus seen a chemically iron - silicide .
Happiness could so far only be found in the form of microcrystalline, massive aggregates of silvery to white-yellow color.
Etymology and history
Hapkeit is named after Professor Bruce Hapke , who made a prediction about the mineral back in 1973 .
Hapkeit was discovered in April 2004 in a lunar meteorite from the Dhofar region in Oman . In the same year it was recognized as a mineral by the IMA .
classification
Since Hapkeit was only discovered in 2004, it is not listed in the Strunz classification of minerals (8th edition), which has been outdated since 2001 . Only the "Lapis mineral directory" published in 2008, which is still based on the classic system of Karl Hugo Strunz out of consideration for private collectors and institutional collections , lists the mineral under system no. I / A.12-35 .
The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), assigns Hapkeit to the class of "elements" and there to the department of "metallic carbon, nitrogen and phosphorus compounds". This division is, however, further subdivided according to the exact type of compound, so that the mineral is to be found according to its composition in the sub-division of "silicides", where together with gupeiite , suessite and xifengite it forms the unnamed group 1.BB.05 .
The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the Hapkeit to the class of "elements" and there in the department of the same name. Here it is together with Suessit , Gupeiit , Xifengit , Luobusait , Mavlyanovit and Brownleeit in the "Suessitgruppe, Silicide" with the system no. 01.01.23 to be found in the subsection of " Elements: metallic elements other than the platinum group ".
Education and Locations
Hapkeite formed of iron-containing gases in a vacuum after the impact of a meteorite on the lunar surface deposed.
In addition to its type locality , the lunar meteorite Dho 280 found in the Omani region of Dhofar, hapiness could also be detected in the lunar rock from the Mare Crisium , which the Luna 24 probe brought with it during its mission.
Crystal structure
Hapkeit crystallizes cubically in the space group Pm 3 m (space group no. 221) with the lattice parameter a = 2.831 Å and one formula unit per unit cell .
Individual evidence
- ↑ a b c d Webmineral - Hapkeite (English)
- ↑ a b IMA / CNMNC List of Mineral Names - Hapkeite (PDF 1.8 MB; p. 115)
- ↑ Stefan Weiß: The large Lapis mineral directory . 5th edition. Christian Weise Verlag, Munich 2008, ISBN 978-3-921656-70-9 , p. 107 .
- ↑ MinDat - Hapkeite (English)
literature
- M. Anand, LA Taylor, MA Nazaraov, J. Shu, HK. Mao, RJ Hemley: New Lunar Mineral HAPKEITE (PDF; 257 kB), in: Lunar and Planetary Science , Volume XXXIV (2003)
Web links
- Mineral Atlas: Hapkeit (Wiki)