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Gumbeyka
Basic information Name: Gumbeyka
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2022
Country: Russia
Mass:help 415 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  L6
Recommended:  L6    [explanation]

This is 1 of 12663 approved meteorites (plus 8 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 11 Feb 2023
Writeuphelp
Writeup from MB 112:

Gumbeyka        53°18.633’N, 59°24.015’E

Chelyabinskaya oblast’, Russia

Find: 29 April 2022

Classification: Ordinary chondrite (L6)

History: One fragment of meteorite (415.0 g) was found 29 April 2022 by Damir Gilmanov using a Clon PI W pulse metal detector in soil at a depth of 10-15 cm near the settlement of Pervomaisky (Agapovsky District, near the city of Magnitogorsk, Chelyabinskaya oblast’). The steppe area, where the meteorite was found (southeastern edge of the Pervomaisky settlement), is hilly, overgrown with grass, and possibly was once plowed land. It is located near the Gumbeyka River, a left tributary of the Ural River. The name of the meteorite (Gumbeyka) is given for the Gumbeyka River and settlement of Gumbeyka (railway station) located 4 km east of Pervomaisky.

Physical characteristics: The meteorite is angular and roughly rounded. The surface is totally covered by dark fusion crust. The interior is light colored and contains visible opaque shock veins. The meteorite sample is fresh, in general, but thin haloes of Fe-hydroxides are present around some metal grains.

Petrography: Victor V. Sharygin, SIGM and UrFU, Kseniya A. Dugushkina, RAS-UB and UrFU The meteorite contains a fine-grained to coarse recrystallized matrix and rare chondrules. The chondrules (mainly POP species) are poorly defined; their sizes vary from 300 to 800 µm. The matrix consists of olivine, low-Ca pyroxene, diopsidic clinopyroxene, albitic plagioclase, troilite, Fe-Ni-metal, chromite and accessory chlorapatite and merrillite. Plagioclase grains are larger than 50-100 µm. This indicates a petrologic type of 6. Chromite-plagioclase assemblages are found in the recrystallized chondrite matrix. They range in size from 10–300 µm and consist of 0.2–30 µm rounded to euhedral chromite grains surrounded by plagioclase or feldspar glass. Undulatory extinction, irregular and planar fractures (three directions) in olivine and the presence of opaque shock veins assume a shock stage of S4. The thickness of opaque shock veins is up to 1 mm. They contain metal-sulfide blebs in fine-grained low-Ca pyroxene-rich + glass matrix. Weathering grade is W1 due to the presence of thin Fe-hydroxide rim around some metal grains. Hibbingite was identified among Fe-hydroxides.

Geochemistry: SEM-EDS (Kseniya A. Dugushkina, RAS-UB and UrFU, and Victor V. Sharygin, SIGM and UrFU) Olivine Fa25.04±0.41 (N=88), low-Ca pyroxene Fs21.51±0.39Wo1.59±0.28 (N=63), plagioclase Ab81.9An9.6Or8.5 (N=41), Cr-bearing clinopyroxene En45.7Fs8.0Wo46.3 (Cr2O3 – 0.6-1.1 wt.%, N=16), chromite Crt81.5Spl12.5 (N=17), chlorapatite, merrillite, FeNi-metals and troilite. Chlorapatite contains F (up to 0.55 wt.%); Cl – 5.2, Na2O – 0.5 wt.% (N=8). Merrillite is poor in FeO (up to 1.1 wt.%, N=4). Composition of metals (in wt.%): kamacite (N=29) – Fe 92.62±0.51, Ni – 6.78±0.64, Co – 0.62±0.07; taenite (N=15) – Fe 69.16±2.41, Ni 30.39±2.68, Co 0.31±0.05. Secondary hibbingite is rich in Cl (up to 16.6 wt.%).

Classification: Ordinary chondrite. L6, S4, W1

Specimens: Damir Gilmanov - 349.0 g (main mass); UrFU - 63.0 g; SIGM - 3.0 g.

Data from:
  MB112
  Table 0
  Line 0:
State/Prov/County:Chelyabinskaya oblast'
Origin or pseudonym:hilly steppe
Date:29 April 2022
Latitude:53°18.633'N
Longitude:59°24.015'E
Mass (g):415.0
Pieces:1
Class:L6
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):25.04±0.41 (N=88)
Ferrosilite (mol%):21.51±0.39 (N=63)
Wollastonite (mol%):1.59±0.28 (N=63)
Classifier:K. A. Dugushkina, RAS-UB and UrFU, V. V. Sharygin, SIGM and UrFU, V. I. Grokhovsky, UrFU
Type spec mass (g):63.0
Type spec location:UrFU
Main mass:Damir Gilmanov (Pervomaisky settlement)
Finder:Damir Gilmanov (Pervomaisky settlement)
Comments:Field name Pervomaisky-2; submitted by Victor V. Sharygin
Institutions
   and collections
UrFU: Ural Federal University, 620002, 19 Mira street, Ekaterinburg, Russia (institutional address; updated 14 Jan 2015)
SIGM: V.S. Sobolev Institute of Geology and Mineralogy SB RAS, pr. Akademika Koptyuga, 3 Novosibirsk, 630090, Russia; Website (institutional address; updated 10 May 2017)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Evgeniy Trofimov            
Public domain photographs:
Victor V. Sharygin   
Geography:

Russia
Coordinates:
     Recommended::   (53° 18' 38"N, 59° 24' 1"E)

Statistics:
     This is 1 of 4 approved meteorites from Chelyabinskaya oblast', Russia
     This is 1 of 156 approved meteorites from Russia (plus 5 unapproved names) (plus 19 impact craters)
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