Itqiy meteorite
| Itqiy meteorite | |
|---|---|
| Type | Chondrite (ongoing scientific debate) |
| Class | Enstatite chondrite (ongoing scientific debate) |
| Group | EH7-an (ongoing scientific debate) |
| Parent body | NWA2526-Itqiy[1] |
| Composition | Enstatite (78 %), meteoric iron (22 %), sulfides.[2] |
| Country | Western Sahara[3] |
| Coordinates | Lua error in package.lua at line 80: module 'strict' not found.[3] |
| Observed fall | Yes[3] |
| Fall date | 1990[3] |
| Found date | 1990 + 2000-07[3] |
| TKW | 0.410 kilograms (0.90 lb)[3] + 4.310 kilograms (9.50 lb)[3] |
The Itqiy meteorite is an enstatite-rich stony-iron meteorite. It is classified as an enstatite chondrite of the EH group that was nearly melted and is therefore very unusual for that group.[2][4] Other classifications have been proposed and are an ongoing scientific debate.
Contents
History
Itqiy fell during 1990 in Western Sahara and is named after a small hamlet.[3][5] One stone was recovered soon after by a nomad, a second stone was recovered in July 2000 by Marc, Luc, and Jim Labenne who were searching for meteorites in the same location.[3] It was first described in 2001.[6]
Mineralogy and petrology
Itqiy is a stony-iron meteorite consisting of 78% enstatite and 22% meteoric iron. The meteoric iron is kamacite with 5.77% nickel. Small amounts of other minerals include troilite, Mg-Mn-Fe sulfides and Fe-Cr sulfides.[2][7]
Classification
The meteorite was described as an "Enstatite meteorite ungrouped" in 2001. It was reasoned that Itqiy represents a rock that formed through partial melting of an enstatite chondrite.[2][7] In 2006 Itqiy was classified as a member of the EH group, petrologic type 7, emphasizing the strong metamorphic overprint of the specimen.[2] In 2008 it was argued that Itqiy represents the residue of an enstatite chondrite that was partially molten about 20%, thereby removing the plagioclase.[8] In 2011 it was proposed that Itqiy, QUE 94204, QUE 97289, QUE 97348, NWA 2526 and possibly Yamato 793225 are part of a new group that should be called "primitive enstatite achondrites".[9]
Parent body
In 2010 it was proposed that NWA 2526 and Itqiy share the same parent body.[8]
See also
References
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- ↑ 8.0 8.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
