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| Shidian | |||||||||||||||||||||||||||
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| 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:  1809 g | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 636 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 | ||||||||||||||||||||||||||
| Writeup |
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: |
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| Data from: MB113 Table 0 Line 0: |
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| Institutions and collections |
IGCAS: Institute of Geochemistry Chinese Academy of Sciences, Guiyang, China (institutional address; updated 27 Mar 2018) |
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| Catalogs: |
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| 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: |
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Geography:
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Statistics: This is 1 of 5 approved meteorites from Yunnan, China This is 1 of 516 approved meteorites from China (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||
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| Revision history: |
This lists important revisions made to data for this record.
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