METEORITE A very Rare EL3 From Africa, NWA 2828, 21.5 g

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Michael Cottingham Meteorite Collection Specimen, MCOTT#212 is a 21.5 gram complete slice of NWA 2828, "A very unusual EL3 Chondrite Paleo-Meteorite occurring as cobbles in a terrestrial conglomerate. This enstatite-rich meteorite was first discovered in Algeria in 2005. It was originally thought to be an aubrite, but scientific examination of new material has revealed the presence of features that require revision of that classification. Several stones contain sparse (<1 vol.%) but very distinct round, radial pyroxene chondrules up to 3 mm across (image 2), as well as rounded, fine-grained aggregates up to 6 mm across composed mainly of either enstatite or sodic plagioclase (image 3). The dominant primary phase in NWA 2828 is essentially pure enstatite, which forms stubby prismatic grains." "New information on the find site in Algeria indicates that the NWA 2828 material was excavated from a subsurface deposit, and terrestrial rhyolite pebbles and sandy matrix are attached to several NWA 2828 stones (image 1). The pebbles cling to them via iron oxide/carbonate cement. The oxides are finely layered and alternate between magnetite and hematite, with inter layers of saline deposits. This suggests times of past wet to dry periods in a river or salt lake. However, the iron oxides contain nickel in a range of up to 6.5 percent, which strongly suggests that the pervasive 0.5-2 mm cavities in the NWA 2828 stones are the result of solution etching. The scientists who conducted the studies have concluded that incoming solutions replaced the primary nickel-iron grains with salts, carbonates, etc., while outgoing solutions formed nickel-rich iron oxides on the exterior of the stones, and cemented all of the neighboring terrestrial debris to the meteorite stones. " (Hupe Collection) PLEASE NOTE: The Above Information was taken from a Hupe Auction for the same material. Although, I don't make a habit of using other people's descriptions in verbatim, t is no other source at the moment for information for this great new meteorite. When it is published in the Meteoritical Bulletin, I will rewrite the description. Michael Cottingham's Meteorite Collecting History and (Mini) Bio... I first started my cosmic journey with meteorites in 1996. I have always been interested in Natural History and ever since I was very young, I have collected rocks, fossils, artifacts and the like. In fact, I have been pretty darn good at finding unusual Natural History objects. However, I had never found a meteorite and I didn't even know w to begin. So, I first started by buying a few specimens to see what they actually looked like. Then I would take these specimens out into the desert area w I live and I would place them on the ground. I was trying to train my "eye" to see differently. Sometimes, I would take my meteorite specimens and throw them as far as I could into the desert, and then I would go search for them. I started to search dry lake beds and dune areas in the Southern part of my state. In Jan/1997 I was searching an area East of Columbus, New Mexico and I finally did what most people though was impossible (especially my wife) ... I found a NEW Meteorite! This was the Columbus , New Mexico , H5. T were seven small pieces of this chondrite and the total known weight at the time was only 184 grams. Since then I have recovered about 2 kilos of fragments. On an interesting note, it only took me about 300 hours to find my first meteorite! My wife and I had a bet going at the time of the Columbus find. She said, "If, If you find a new meteorite, then you can go anyw in the world and go hunt!" Well, I did. I next took our bank savings and headed out to search the Imilac strewnfield in the Atacama Desert of Chile. This area had produced many meteorites, but was remote and difficult to search. I went t and found 20 kilos of Imilac Pallasite individuals. I sold most, bought more meteorites and continued to h... read more

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