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Shidian
Basic information Name: Shidian
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2017
Country: China
Mass:help 1809 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  CM2
Recommended:  CM2    [explanation]

This is 1 of 633 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 27 Jan 2024
Writeuphelp
Writeup from MB 108:

Shidian        24°42’27.54"N, 99°4’41.92"E

Yunnan, China

Confirmed fall: 2017 Nov 27

Classification: Carbonaceous chondrite (CM2)

History: On November 27, 2017, at about 14:30 local time, the fall of two stones were witnessed by eight local villagers and collected by one of them. The two stones fell in Dapuzhai and Chenjiazhai villages, in Shidian county, Yunan province. The two meteorites are 235 g (E 99°4’29.20", N24°41’54.81") and 1574 g (E 99°4’41.92", N24°42’27.54"), separated by about 1 km.

Physical characteristics: Two meteorites partly covered with fusion crust were recovered. The interior of the stones are black with abundant white dots.

Petrography: The meteorite consists of fine-grained matrix material (84.6 vol%) containing phyllosilicates, type I chondrules (15.4 vol%; average apparent diameter 380±120 µm, n=11) and rare CAIs. The dominant mineral of the meteorite is olivine and serpentine. Accessory minerals include troilite and calcite. Most chondrules are altered, but there still exist a few chondrules and forsteritic olivine.

Geochemistry: Forsterite Fa0.51±0.16, range Fa0.29-0.90 (N=11, EPMA).

Classification: Carbonaceous chondrite (CM2).


Writeup from MB 113:

Shidian        24°42’27.54"NN, 99°4’41.92"E

Yunnan, China

Confirmed fall: 2017 Nov 27

Classification: Carbonaceous chondrite (CM2)

History: On November 27, 2017, at about 14:30 local time, a meteorite fall was witnessed by eight local villagers and collected by one of them. The two stones fell in Dapuzhai and Chenjiazhai village, respectively, Shidian county, Yunan province. The two meteorites are 235 g (E 99°4’29.20", N24°41’54.81") and 1574 g (E 99°4’41.92", N24°42’27.54") respectively.

Physical characteristics: Two meteorites partly covered with fusion crust were recovered. The interior of the stone is black with abundant white dots.

Petrography: The meteorite consists of fine-grained matrix material (84.6 vol%), chondrules of type I (15.4 vol%; 250 to 850 ?m) and rare CAIs. The dominant minerals are olivine and serpentine. Accessory minerals include troilite and calcite. Coarse components (chondrules, CAIs, etc.) are surrounded by fine-grained rims, which consist of tochilinite/cronstedtite. Most chondrules are altered, but there still exist a few chondrules containing forsteritic olivine.

Geochemistry: Forsterite Fa0.51±0.16 (Fa0.29-0.90, EPMA).

Classification: There is abundant aqueous alteration in this meteorite; however, not all of the primary chondrules are altered. Therefore, the meteorite should be classified as type 2

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Yunnan
Date:2017 Nov 27
Latitude:24°42'27.54"N
Longitude:99°4'41.92"E
Mass (g):1809
Pieces:2
Class:CM2
Fayalite (mol%):0.51±0.16 (n=11)
Classifier:Fanyan, IGCAS
Type spec mass (g):25
Type spec location:IGCAS
Main mass:Lyu Jiincheng
Comments:Submitted by Li shijie
Data from:
  MB113
  Table 0
  Line 0:
State/Prov/County:Yunnan
Date:2017 Nov 27
Latitude:24°42'27.54"NN
Longitude:99°4'41.92"E
Mass (g):1809
Pieces:2
Class:CM2
Fayalite (mol%):0.51±0.16 (0.29-0.90)
Classifier:Fanyan, IGCAS
Type spec mass (g):25
Type spec location:IGCAS
Main mass:Lyu Jiincheng
Comments:Submitted by Li shijie
Institutions
   and collections
IGCAS: Institute of Geochemistry Chinese Academy of Sciences, Guiyang, China (institutional address; updated 27 Mar 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Cute child   
Guchen Chen   
Ziyao Wang            
Public domain photographs:
Li Shijie   
Geography:

China
Coordinates:
     Recommended::   (24° 42' 28"N, 99° 4' 42"E)

Statistics:
     This is 1 of 5 approved meteorites from Yunnan, China
     This is 1 of 512 approved meteorites from China (plus 12 unapproved names) (plus 1 impact crater)
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