1.80 grams NWA 4799 EH-melt rock Meteorite with COA - ex Greg Hupe for Sale

On eBay Now...

1.80 grams NWA 4799 EH-melt rock Meteorite with COA - ex Greg Hupe For Sale

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

1.80 grams NWA 4799 EH-melt rock Meteorite with COA - ex Greg Hupe:
$14.99

This meteorite came from a small20 year-oldpersonal collection.I bought these at the September 2023 Denver Mineral Show.This comes with the meteorite and card you see in the photos.
Northwest Africa 4799Basic informationName:Northwest Africa 4799
This is an OFFICIAL meteorite name.
Abbreviation:NWA 4799
Observed fall:No
Year rock[explanation]
This is 1 of 7 approved meteorites classified as EH-melt rock.
Comments:Approved 17 Apr 2008
Revised 11 May 2019: ReclassificationWriteup

Northwest Africa 4799

Algeria

Find: May 2007

Achondrite (aubrite)

History:Purchased by Greg Hupé in May and October 2007 from a Moroccan dealer in Tagounite.

Physical characteristics:Eighty-six light brown stones and fragments (total 365 g); most are complete, some are broken, and some have remnant fusion crust.

Petrography:(A. Irving and S. Kuehner,UWS) The overall texture is that of a brecciated igneous rock, with larger angular to rounded clasts (some showing cumulus texture) in a matrix of smaller grains. The dominant mineral is pure enstatite with lesser amounts of interstitial albite (some in graphic intergrowths with a silica polymorph) and accessory Si-bearing kamacite, Ti-Cr-bearing troilite, oldhamite, niningerite, Ti-bearing daubreelite and schreibersite. The enstatite grains exhibit polysynthetic twinning indicative of inversion from former clinoenstatite. Grain boundary coatings of goethite or limonite and orange staining along enstatite cleavage planes, as well as veinlets of calcite, are evidently products of terrestrial desert weathering.

Geochemistry:Enstatite (En99.5Fs0.1Wo0.4), kamacite (Fe 92.1 wt%, Ni 4.5 wt%, Si 3.4 wt%).

Classification:Achondrite (aubrite).

Specimens:A total of 20.1 g and one polished thin section are on deposit atUWS.GHupéholds the main mass.

NWA 4799: reclassification.NWA 4799,NWA 7214,NWA 7809, andNWA 11071contain unfractionated modal abundances of plagioclase, troilite, and metal, which is similar to other enstatite chondrite meteorites. These NWA samples contain higher abundances of metal (7-14 vol.%) compared to aubrites. The only silicate phases in these samples are enstatite and plagioclase, whereas aubrites present olivine and diopside. Meteorites of enstatite chondrite parentage typically do not contain diopside or olivine. Other distinguishing features are metal/troilite ratios and Ti concentrations in troilite. Aubrites contain lower metal/troilite ratios and high Ti in troilite, whereas enstatite chondrite meteorites show the opposite characteristics (as these NWA meteorites do). The metal in these samples presents a higher concentration of Si compared to the aubrites (4 wt.% Si in the NWA samples versus 0.9 wt. % Si in aubrites. Graphite was also observed in these samples, which is not typically found in aubrites. The NWA meteorites show an affinity for an EH chondritic parent body origin, as seen by low Ti in troilite, high Si in metals, the presence of niningerite and graphite, and the lack of diopside and forsterite. As metal and troilite are observed as inclusions within enstatite grains, it suggests the rocks were formed by complete melting. For the complete petrographic, mineralogical and geochemical analyses of these four meteorites, and references to data listed above, seeUdry et al. (2019)

I will combine the cost of shipping for all the items you win during a 2 week period that are paid for in a single transaction. Please note. If items are paid for separately, they will be shipped separately due to tracking reasons. Also, I ship items within 24 hours from the time of payment. Therefore, do not pay for any items until you are done offerding so I can ship everything in one package. Please take your time and don\'t pay for up to 2 weeks.

Shipping includes tracking and delivery confirmation.

I am a member of the awesome Global Meteorite Association #GMA0021

Please only pay in one payment when you are all done. Postage is $6.49 for all the items you win over a 2 week period. ONLY pay in ONE PAYMENT when you are all done winning and ready to buy everything you wanted. I mail out all items the same day or in the morning.

Thanks, John Humphries, P.O. BOX 310, Tombstone, AZ