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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
Recommended:  LL5-melt breccia    [explanation]

This is 1 of 5 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
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 Meteoritical Bulletin, no. 111, in preparation (2022)
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     Recommended::   (40° 21' 0"N, 93° 31' 12"E)

     This is 1 of 298 approved meteorites from Xinjiang, China (plus 5 unapproved names)
     This is 1 of 462 approved meteorites from China (plus 10 unapproved names) (plus 1 impact crater)
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