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Basic information Name: Orotukan
     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 555 kg
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 146 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped.   [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons
Comments: Approved 20 Dec 2022
Writeup from MB 111:

Orotukan        62°9’8" N, 151°16’15" E

Magadanskaya oblast’, Russia

Find: Aug 2022

Classification: Iron meteorite (ungrouped)

History: The meteorite was found at the foot of the left slope of the river valley of the downstream of the Strelka Creek, the left tributary of the Orotukan River.

Petrography: (Ksenia A. Konovalova, FMMR). Medium-grained octahedrite having a well-developed Widmanstätten pattern with 0.7-1.1 mm kamacite bands. Thin lamellae of taenite in kamacite have sizes up to 70 µm. Large schreibersite coarse grained inclusion (1-2 mm) is occured.

Geochemistry: Mineral composition and Geochemistry: EDS analyses (Atali Agakhanov, Ksenia Konovalova, FMMR). Kamacite (in wt. % n = 2) : Fe - 89.45, Ni - 7.6, Co - 0.74, taenite (in wt. %, n = 7): Fe - 62.07, Ni - 35.2, Co - 0.37, schreibersite (in wt.%, n=6): Fe - 44.88, Ni - 38.04, Co - 0.24, P - 14.49. Bulk composition of the meteorite (ICP-MS, V.K. Karandashev, IPTM RAS):Ni = 8.61; Co = 0.45 (both in wt%);Cr =154, Cu = 127, Ga = 39.4, Ge = 54.9, Mo = 17.2, Ru = 23.6, Rh = 3.3 Pd = 3.7, W = 2.5, Re = 1.5, Os = 20.2, Ir = 13.3, Pt = 26.1, Au = 0.82 (all in µg/g). 

Classification: (Kseniya A. Konovalova, FMMR). Iron, Ungrouped. Based on Ga, Ge content iron is reminiscent IAB and IID meteorites. Ni (8.61 wt.%) and Co (0.45 wt.%) as similar to IAB complex group, Au (0.82 µg/g) is lower than that of IAB irons, and Ge (54.9 µg/g) is lower than that of IID, irons so this sample is ungrouped.

Specimens: ZOLOTOY IRIS LLC (Magadan, Russia) holds main mass, 51 g - FMMR

Data from:
  Table 0
  Line 0:
State/Prov/County:Magadanskaya oblast'
Date:Aug 2022
Latitude:62°9'8" N
Longitude:151°16'15" E
Mass (g):555 kg
Class:Iron, ungrouped
Classifier:Ksenia A. Konovalova, FMMR
Type spec mass (g):51
Type spec location:FMMR
Main mass:ZOLOTOY IRIS LLC (Magadan, Russia)
Finder:ZOLOTOY IRIS LLC (Magadan, Russia)
Comments:Field name is FN791; submitted by Ksenia A. Konovalova, [email protected]
   and collections
FMMR: Fersman Mineralogical Museum, Leninskiy prospekt 18 korpus 2, Moscow, Russia, 119071, Russia; Website (institutional address; updated 24 Feb 2018)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     Recommended::   (62° 9' 8"N, 151° 16' 15"E)

     This is 1 of 6 approved meteorites from Magadanskaya oblast', Russia
     This is 1 of 153 approved meteorites from Russia (plus 5 unapproved names) (plus 19 impact craters)
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