Description: Northwest Africa 869Basic informationName: Northwest Africa 869 This is an OFFICIAL meteorite name. Abbreviation: NWA 869 Observed fall: No Year found: 2000 Country: (Northwest Africa) Mass 2 t Classification history:Meteoritical Bulletin: (2006) L4-6 (2013) L3-6Recommended: L3-6 This is 1 of 60 approved meteorites classified as L3-6. Comments:Approved 14 Nov 2005 Revised 29 Oct 2013: Revised classification and new description Northwest Africa 869Northwest AfricaFind: 2000 or 2001Ordinary chondrite (L4–6)History: It is quite clear that meteorite collectors in Northwest Africa have discovered a large L chondrite strewn field at an undisclosed location. At least 2 metric tons of material comprising thousands of individuals has been sold under the name NWA 869 in the market places of Morocco and around the world. Individual masses are known to range from <1 g to >20 kg. It is certain that NWA 869 is paired with other NWA meteorites, although no systematic survey has been done. It is also possible that some stones sold as NWA 869 are not part of the same fall, although dealers are confident that most of the known masses are sufficiently distinctive from other NWA meteorites in terms of surface and internal appearance that the error rate should be fairly low. Scientists are advised to confirm the classification of any specimens they obtain before publishing results under this name.Petrography and Geochemistry: (A. Rubin, UCLA) A fragmental breccia of type 4–6 material; one thin section dominated by an L5 lithology gave olivine (Fa24.2).Classification: Ordinary chondrite (L4–6); W 1, S3.Specimens: A 189.3 g type specimen is on deposit at UCLA. Revised classification and description. Submitted by K. Metzler, IfP Physical characteristics: Most samples are individual meteorites but some fragments (mostly >1 kg) also occur. In most cases the fusion crust has been polished or ablated by wind erosion. Many samples are more severely affected and show faces with deep wind erosion features. Fracture faces, formed by ground collision, show a typical gray-green color and sometimes visible brecciation (light and/or dark clasts). Due to the coarseness of this breccia, there are some stones that consist of only a single lithology.Petrography: This chondritic breccia consists of about 75 vol% matrix with unequilibrated and equilibrated L-chondrite clasts (up to 5.5 cm), some of which display shock-darkening. Impact melt-rock clasts, themselves either clast-free or clast-poor, also occur and are strongly depleted in Fe,Ni metal and sulfide.Geochemistry: Northwest Africa 869 is a regolith breccia, containing solar noble gases and preirradiated lithologies. Olivine in lithic clasts: Fa0.2-49.2; olivine in matrix: Fa10.3-29.3; low-Ca pyroxene in lithic clasts: Fs2.1-35.9; low-Ca pyroxene in matrix: Fs7.0-23.9. Bulk oxygen isotopes: δ17O = 3.52; δ18O = 4.67; Δ17O = 1.09 per mil. Terrestrial age: 4.4 ± 0.7 ka. Preatmospheric meteoroid size and mass: 225 ± 25 cm, 120-230 T.Classification: Because NWA 869 contains unequilibrated clasts, its classification is revised to L3-6. Place of purchase:UnknownDate:2001 or 2002Pieces:manyClass:L4-6Shock stage:S3 Nice specimen for your collection. Authenticity guaranteed. 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 eBay 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 bidding 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. 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 85638
Price: 4.89 USD
Location: Tombstone, Arizona
End Time: 2024-09-25T00:50:51.000Z
Shipping Cost: 6.49 USD
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Item Specifics
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Form, Shape: Individual
Type of Mineral: meteorite
Specimen Type: Display Specimens
Item Type: Meteorite
