|Type||Chondrite (ongoing scientific debate)|
|Class||Enstatite chondrite (ongoing scientific debate)|
|Group||EH7-an (ongoing scientific debate)|
|Composition||Enstatite (78 %), meteoric iron (22 %), sulfides.|
|Found date||1990 + 2000-07|
|TKW||0.410 kilograms (0.90 lb) + 4.310 kilograms (9.50 lb)|
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. Other classifications have been proposed and are an ongoing scientific debate.
Itqiy fell during 1990 in Western Sahara and is named after a small hamlet. 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. It was first described in 2001.
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.
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. In 2006 Itqiy was classified as a member of the EH group, petrologic type 7, emphasizing the strong metamorphic overprint of the specimen. In 2008 it was argued that Itqiy represents the residue of an enstatite chondrite that was partially molten about 20%, thereby removing the plagioclase. 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".
In 2010 it was proposed that NWA 2526 and Itqiy share the same parent body.
- Keil, Klaus (31 December 2009). "Enstatite achondrite meteorites (aubrites) and the histories of their asteroidal parent bodies". Chemie der Erde - Geochemistry 70 (4): 295–317. doi:10.1016/j.chemer.2010.02.002.
- "Itqiy". Meteoritical Society.
- "Itqiy". Meteoritical Society. Retrieved 21 December 2012.
- "EH7-an". Meteoritical Society.
- "Meteorites Western Sahara 7". niger-meteorite-recon.de.
- Grossman, Jeffrey N.; Jutta Zipfel (2001). "The Meteoritical Bulletin, No. 85, 2001 September". Meteoritics & Planetary Science 36: 293–322. Retrieved 21 December 2012.
- Patzer, Andrea; Hill, Dolores H.; Boynton, William V. (1 November 2001). "Itqiy: A metal-rich enstatite meteorite with achondritic texture". Meteoritics & Planetary Science 36 (11): 1495–1505. doi:10.1111/j.1945-5100.2001.tb01841.x.
- Keil, Klaus (2010). "Enstatite achondrite meteorites (aubrites) and the histories of their asteroidal parent bodies". Chemie der Erde - Geochemistry 70 (4): 295–317. doi:10.1016/j.chemer.2010.02.002.
- IZAWA, Matthew R. M.; FLEMMING, Roberta L.; BANERJEE, Neil R.; MATVEEV, Sergei (1 November 2011). "QUE 94204: A primitive enstatite achondrite produced by the partial melting of an E chondrite-like protolith". Meteoritics & Planetary Science 46 (11): 1742–1753. doi:10.1111/j.1945-5100.2011.01263.x.