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Lieksa
Basic information Name: Lieksa
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2017
Country: Finland
Mass:help 280 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  Pallasite, ungrouped
Recommended:  Pallasite, ungrouped    [explanation]

This is 1 of 12 approved meteorites classified as Pallasite, ungrouped.   [show all]
Search for other: Metal-rich meteorites, Pallasites
Comments: Approved 29 May 2023
Writeuphelp
Writeup from MB 112:

Lieksa        63°24.382’N, 30°04.227’E

Pohjois-Karjala, Finland

Find: 2017 May 30

Classification: Pallasite (ungrouped)

History: Pekka Vallimies discovered a rust-covered rock as a potential ore specimen in the area of Löpönvaara, Finland, ~10 km from Lieksa. After removing the rust with a wire brush, Vallimies thought it may be a meteorite and submitted the find to the Geological Survey of Finland (GTK). Examination, led by Dr. Kari Kinnunen, confirmed a meteoritic origin, and Vallimies donated this 238 g stone to the meteorite collection of the Finnish Museum of Natural History LUOMUS on May 30, 2018. Numerous smaller pieces of meteorite (up to 27.1 g) have been subsequently discovered in the find area.

Petrography: (Arto Luttinen) The sample was examined by x-ray tomography and was shown to be a mixture of ~80% metal and ~20% rounded silicates (3 mm in size) and oxides. Significant weathering around the edges and in cracks.

Geochemistry: Olivine Fa23.0±0.1 (n=3). Metal: kamacite Ni 4.8-6.7%; taenite 30.9-38.1% Ni. Siderophile Chemistry LA-ICP-MS (average of 5 rasters, 5 mm long and 100 µm wide each) Fe 88.6%, Ni=10.6%, Co=0.7%. All other elements in ppm: Ga=2.1, Ge=58.1, As=4.8, Au=0.7. Highly siderophile elements by isotope dilution: Re=0.60 ppm, Os=7.99 ppm, Ir=7.77 ppm Ru=10.24 ppm, Pt=13.76 ppm, Pd=3.44 ppm. EPMA, LA-ICP-MS and ID HSE analyses were carried out at UMd (R.D. Ash, E.M. Chiappe, RJ. Walker).

Classification: Pallasite (ungrouped). The olivine is more fayalitic than other pallasites and the Ge/Ga ratio significantly higher

Data from:
  MB112
  Table 0
  Line 0:
State/Prov/County:Pohjois-Karjala
Date:2017 May 30
Latitude:63°24.382'N
Longitude:30°04.227'E
Mass (g):280
Pieces:many
Class:Pallasite, ungrouped
Weathering grade:low
Fayalite (mol%):23.0±0.1 (n=3)
Classifier:Richard Ash
Type spec mass (g):238
Type spec location:LTKM
Main mass:LKTM
Finder:Pekka Vallimies
Comments:Submitted by Richard Ash
Institutions
   and collections
LTKM: Arto Luttinen Finnish Museum of Natural History P.O.Box 44 (Jyrängöntie 2) 00014 University of Helsinki Finland, Finland; Website (institutional address; updated 14 Jan 2015)
GTK: Geological Survey of Finland GTK Vuorimiehentie 5, P.O. Box 96, FI-02151 Espoo, Finland (institutional address; updated 20 May 2024)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Geography:

Finland
Coordinates:
     Recommended::   (63° 24' 23"N, 30° 4' 14"E)

Statistics:
     This is 1 of 2 approved meteorites from Pohjois-Karjala, Finland
     This is 1 of 14 approved meteorites from Finland (plus 11 impact craters)
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