Name: 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 47 approved meteorites classified as R3.
Comments:
Approved 8 Apr 2021
Writeup
Writeup from MB 110:
Northwest Africa 13758 (NWA 13758)
Adrar, Algeria
Purchased: 2017
Classification: 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 m (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.
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.
Bibliography:
Bischoff, A. (2000) Mineralogical characterization of primitive, type-3 lithologies in Rumuruti chondrites. Meteorit. Planet. Sci.35 699-706
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13758
Observed fall: No
Year found: 2017
Country: Algeria
Mass: 100 kg
history:
This is 1 of 47 approved meteorites classified as R3.
MB110
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