6.19 grams NWA 13758 Meteorite ( Rumuruti R3 ) cut fragment slice with a COA

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Northwest Africa 13758Basic informationName: Northwest Africa 13758 This is an OFFICIAL meteorite name. Abbreviation: NWA 13758 Observed fall: No Year found: 2017 Country: Algeria Mass 100 kg Classification history:Recommended: R3 This is 1 of 44 approved meteorites classified as R3. Comments:Approved 8 Apr 2021 Northwest Africa 13758 (NWA 13758)Adrar, AlgeriaPurchased: 2017Classification: Rumuruti chondrite (R3)History: A large group of identically appearing stones, found together, was purchased by a Saharan dealer from a nomad in Algeria and was subsequently acquired by Mark Lyon and Dustin Dickens. The original find was reportedly in the Tanezrouft Plateau, with the nearest town being Reggane, Algeria.Physical characteristics: Approximately 500 pieces ranging in mass from <1 kg to >5 kg, with a total known weight of approximately 100 kg. Dark brown sandblasted exterior. Saw cut reveals a breccia with fragments up to ~2 cm set in a fine-grained matrix. Abundant distinct chondrules are visible throughout. Two main lithologic domains exist within this meteorite, one has a gray, unstained matrix, and the second has a brownish-orange-stained matrix.Petrography: (C. Agee, UNM) Chondrite with mean apparent chondrule size 350±240 µm (n=21) set in abundant matrix (~35 vol%). Electron microprobe analyses were performed separately on the two main lithologic domains. Domain “A” has compositionally unequilibrated olivine and pyroxene both in chondrules as well as single mineral fragments in the matrix. Very small grains of albitic plagioclase are present. Chromite, pentlandite, and troilite are ubiquitous. No metal or oxidized iron was detected. Domain “B” has compositionally unequilibrated olivine and pyroxene both in chondrules as well as single mineral fragments in the matrix. Domain “B” appears to have slightly more chondrules than domain “A”. Very small grains of albitic plagioclase were present. Ti-rich chromite, pentlandite, and Ni-bearing troilite are ubiquitous. No metal or oxidized iron was detected.Geochemistry: (C. Agee, UNM) Domain “A”: olivine Fa36.6±8.4, CV=23%, Fe/Mn=83±15, n=12; low-Ca pyroxene Fs21.4±6.8Wo0.9±0.5, Fe/Mn=39±19, n=4; augite Fs8.8±0.7Wo46.0±0.2, Fe/Mn=43±4, n=2; plagioclase An8.8±0.6Ab86.5±0.2Or4.7±0.7, n=3. Domain “B”: olivine Fa38.7±5.8, CV=15%, Fe/Mn=87±10, n=12; low-Ca pyroxene Fs10.0±7.7Wo2.0±1.8, Fe/Mn=15±7, n=4; augite Fs11.4±0.9Wo44.8±1.3, Fe/Mn=51±11, n=2; plagioclase An9.2±0.9Ab85.9±1.6Or4.9±0.8, n=3.Classification: Rumuruti chondrite (R3). Domain “A” is approximately R3.7 and domain “B” is approximately R3.9, based on olivine coefficient of variation (CV) Specimens: 1127.72 g complete stone, and a 57.69 g full slice from a different complete stone, are on deposit at UNM. Mark Lyon holds the main mass including a total of 14 pieces weighing 19.84 kg, Dustin Dickens holds ~60 kg of medium to small stones.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

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