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Yumenguan 001
Basic information Name: Yumenguan 001
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2022
Country: China
Mass:help 845 g
Meteoritical Bulletin:  MB 111  (2023)  LL5-melt breccia
Recommended:  LL5-melt breccia    [explanation]

This is 1 of 7 approved meteorites classified as LL5-melt breccia.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 25 Dec 2022
Writeup from MB 111:

Yumenguan 001        40.350°N, 93.520°E

Xinjiang, China

Find: 2022 Mar 21

Classification: Ordinary chondrite (LL5, melt breccia)

History: Discovered by Ashanjiang Mahemuti on March 21, 2022, in the desert near Lop Nur, Xinjiang Province, China and shortly thereafter acquired by Ziyao Wang.

Physical characteristics: One large stone (806 g) plus 8 small pieces. The stones are very dark brown and coated with a glossy desert patina. Interior cut surfaces display small light brown clasts in a dark, almost black matrix.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of small lithic Type 5 chondrite clasts plus some dicrete equilibrated chondrules within an opaque, very fine-grained matrix (~50 vol.%). The clasts consist of sparse well-formed, equilibrated chondrules containing devitrified glass and plagioclase within a relatively coarse grained matrix containing extensively altered kamacite, taenite, low-Ti chromite, troilite and merrillite. The fine-grained melt matrix contains tiny blebby grains of kamacite and troilite. Clasts have shock stage S3.

Geochemistry: Olivine (Fa28.6±0.4, range Fa28.3-29.3, N = 5), low-Ca pyroxene (Fs23.8±0.2Wo1.4±0.1, range Fs23.6-24.1Wo1.2-1.5, N = 4), augite (Fs9.0±0.6Wo44.4±0.9, range Fs8.5-9.4Wo45.0-43.7, N = 2), plagioclase in chondrule groundmasses (Ab58.9-77.6An25.1-14.7Or16.2-7.7, N = 2).

Classification: Ordinary chondrite (LL5-melt breccia).

Specimens: 39.2 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  Table 0
  Line 0:
Place of purchase:China
Date:2022 Mar 21
Mass (g):845
Class:LL5-melt breccia
Weathering grade:W2/3
Fayalite (mol%):28.6±0.4
Ferrosilite (mol%):23.8±0.2
Wollastonite (mol%):1.4±0.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):39.2
Type spec location:UWB
Main mass:WangZ
Comments:Work name WZY-101; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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     Recommended::   (40° 21' 0"N, 93° 31' 12"E)

     This is 1 of 346 approved meteorites from Xinjiang, China (plus 6 unapproved names)
     This is 1 of 516 approved meteorites from China (plus 13 unapproved names) (plus 1 impact crater)
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