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Shinejinst
Basic information Name: Shinejinst
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2018
Country: Mongolia
Mass:help 693 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 6031 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Jan 2020
Writeuphelp
Writeup from MB 109:

Shinejinst        44°37’15.6"N, 99°012’38.1"E

Bayankhongor, Mongolia

Find: 2018 Aug 30

Classification: Ordinary chondrite (H4)

History: Four fragments (156.17, 101.73, 208.17, and 227.35 g) were found on 30 and 31 August 2018 by the UrFU - IAG-MAS meteorite expedition-2018 in Southern Gobi (Pastukhovich A.Yu., Kolunin R.N., Larionov M.Yu., Muraviev L.A., Petrova E.V., Yakovlev G.A., Naasa Ochir) 10 km northwest of Shinejinst, Bayankhongor aimag (province), Mongolia.

Petrography: Classification (K. Dugushkina and S. Berzin, RAS-UB). Petrographic observation of a polished section shows a fine-grained inequigranular recrystallized matrix and chondrules (25%). Chondrite consists of olivine 50%, orthopyroxene 15%, clinopyroxene 10%, plagioclase 15%, chromite 3%, troilite 3-4%, Fe-Ni-metal 3-4%. Also chondrite contains accessory apatite and ilmenite. Predominate porphyritic olivine (PO) and porphyritic olivine-pyroxene (POP) chondrules. Chondrules mostly have even boundaries. Petrographic type is 4. Chromite-plagioclase assemblages are found in the recrystallized matrix. The assemblages range in size from 10-350 µm and consist of 0.2-30- µm-size rounded, euhedral, subhedral and anhedral chromite grains surrounded by plagioclase or glass of plagioclase composition. Moderate oxidation of metal, about 20-60% being affected, alteration of mafic silicates is beginning (weathering grade - W2). The samples are transected by dark shock veins. Shock stage is S3/4.

Geochemistry: EDX analyses by K. Dugushkina, RAS-UB. The meteorite is composed olivine Fa20±2.1 (N=37), low-Ca pyroxene Fs18±0.4En80±0.4Wo1±0.3 (N=17), plagioclase An24±3.5 (N=9), clinopyroxene En49±3.6Fs10±1.7Wo42±2.8 (N=6), chromite, troilite, kamacite (Ni 5.5-6.8 wt%), taenite (Ni 19.7-36 wt%), apatite and ilmenite. Average composition of chromite (N=9): Cr2O3 55.6±0.9 wt%, FeO 28.4±1.4 wt%, MgO 4.8±1.1 wt%, Al2O3 7.8±0.8 wt%, TiO2 2.2±0.2 wt%, MnO 0.7±0.04 wt%, SiO2 0.5±0.17 wt%, CaO 0.1±0.02 wt%, NiO 0.2±0.01 wt%.

Classification: Ordinary chondrite (H4)

Specimens: 591 g (3 samples) at IAG-MAS; 96.43 g sample and 5.30 g cut-off and thin section at UrFU.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Bayankhongor
Date:2018 Aug 30
Latitude:44°37'15.6"N
Longitude:99°012'38.1"E
Mass (g):693.42
Pieces:4
Class:H4
Shock stage:S3/4
Weathering grade:W2
Fayalite (mol%):20±2.1 (N=37)
Ferrosilite (mol%):18±0.5 (N=17)
Wollastonite (mol%):1±0.3 (N=17)
Classifier:Kseniya Dugushkina, RAS-UB
Type spec mass (g):101.73 g
Type spec location:UrFU
Main mass:IAG-MAS
Finder:UrFU-IAG-MAS meteorite expedition
Comments:Submitted by Kseniya Dugushkina dugushkina.kseniya@mail.ru
Institutions
   and collections
UrFU: Ural Federal University, 620002, 19 Mira street, Ekaterinburg, Russia (institutional address; updated 14 Jan 2015)
RAS-UB: Zavaritsky Institute of Geology and Geochemistry Russian Academy of Sciences, Ural Branch 15 Akademika Vonsovskogo str., Ekaterinburg, 620016, Russia (institutional address; updated 19 Apr 2018)
IAG-MAS: Institute of Astronomy and Geophysics Mongolian Academy of Sciences P.O.B-152, Ulaanbaatar – 51, 13343, Mongolia (institutional address; updated 30 Nov 2019)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos:
CreditPhotos
Public domain photographs:
Kseniya Dugushkina         
Geography:

Mongolia
Coordinates:
     Recommended::   (44° 37' 16"N, 99° 12' 38"E)

Statistics:
     This is the only approved meteorite from Bayanhongor, Mongolia
     This is 1 of 12 approved meteorites from Mongolia (plus 4 unapproved names) (plus 1 impact crater)
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