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Kerman 255
Basic information Name: Kerman 255
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2017
Country: Iran
Mass:help 35.3 g
Meteoritical Bulletin:  MB 109  (2020)  H5
Recommended:  H5    [explanation]

This is 1 of 11471 approved meteorites (plus 22 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 31 May 2020
Writeup from MB 109:

Kerman 255        30°45.477’N, 57°48.085’E

Kerman, Iran

Find: 2017 Jan 9

Classification: Ordinary chondrite (H5)

History: Meteorite (3 samples, 35.3 g) was found 9 January 2017 by the UrFU meteorite expedition-2017 in Iran (Pastukhovich A.Yu., Larionov M.Yu., Kruglikov N.A., Zamyatin D.A.) in the northwest part of the Kalout region of the Lut desert. All fragments of the meteorite were observed on the hard surface (probably, the place of fall).

Physical characteristics: Total mass is 35.3 g. All fragments have angular to roughly rounded shape. The surface and interior of the meteorite is light to dark brown in color due to abundant Fe-hydroxides. Some parts have glassy-like surface due to desert weathering. Some small cracks are totally filled with Fe-hydroxides and sulfates.

Petrography: Classification (Victor V. Sharygin, SIGM and UrFU). Petrographic observation of a polished section shows chondrules in a recrystallized matrix. Chondrules are readily delineated and their sizes mostly vary from 600 to 1000 µm. They have PO, POP and RP texture and some of them consist of Ol+Opx+Cpx+Pl±Crt or Ol+Opx+Pl±Crt. Olivine, low-Ca-pyroxene and plagioclase are main minerals in middle-grained matrix. Plagioclase grains are less than 50 µm. This indicates a petrologic type of 5 for the meteorite. Undulatory extinction and irregular fractures in olivine, as well as the absence of opaque shock veins and melt pockets, indicate a shock stage of S2. Grains of FeNi metals (kamacite, taenite, tetrataenite, up to 300 µm) and troilite (up to 250 µm) are partially altered. Weathering products (goethite, "hydrogoethite", akaganeite and other Fe-hydroxides, rarely anhydrite and magnetite) occur as veins and in situ alteration of FeNi-metals and troilite and fill all microfractures in minerals from matrix and chondrules (weathering grade – W2). Clinopyroxene, chromite, chlorapatite and merrillite (up to 300 µm) occur locally in the matrix. Pyrrhotite and hydrated sulfide FeS•nH2O (alteration after troilite?) form grains up to 100-200 µm.

Geochemistry: EDS-WDS analyses (Victor V. Sharygin, SIGM and UrFU). The primary chondrite paragenesis includes olivine Fa19.68±0.20 (N=42), low-Ca-pyroxene Fs17.03±0.23Wo1.42±0.22 (N=31), plagioclase Ab82.8An11.1Or6.1 (N=11), Cr-bearing clinopyroxene En46.6Fs7.7Wo45.7 (Cr2O3 – 0.8 wt.%, N=5), chromite Crt80.9Spl13.9 (N=7), chlorapatite, merrillite, FeNi-metals and troilite. Chlorapatite contains F (0.8-1.1 wt.%) and Cl (4.5-4.9 wt.%, N=2). Merrillite is poor in FeO (0.5-1.8 wt.%, N=12). Composition of metals (in wt.%): kamacite (N=11) – Fe 93.69±1.88, Ni – 5.76±1.86, Co – 0.56±0.07; taenite (N=14) – Fe 72.97±4.06, Ni 26.68±4.11, Co 0.32±0.05; tetrataenite (N=10) – Fe 48.34±1.78; Ni 51.39±1.88, Co 0.20±0.08. Troilite is close to ideal FeS. Pyrrhotite bears up to 2.2 wt.% Ni. Goethite and "hydrogoethite" contain up to 6.6 wt.% NiO and up to 0.7 wt.% CoO.

Classification: (Victor V. Sharygin, SIGM and UrFU). Ordinary chondrite. H5, S2, W2.

Specimens: 24.7 g (2 samples) – UrFU; 10.6 g (1 sample) and thin section – SIGM.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Kalout region of the Lut desert
Date:2017 Jan 9
Mass (g):35.3
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):19.68±0.20 (N=42)
Ferrosilite (mol%):17.03±0.23 (N=31)
Wollastonite (mol%):1.42±0.22 (N=31)
Classifier:Victor V. Sharygin, SIGM and UrFU
Type spec mass (g):24.7
Type spec location:UrFU
Main mass:UrFU, SIGM.
Finder:UrFU meteorite expedition - Iran-2017 (Pastukhovich A.Yu., Larionov M.Yu., Kruglikov N.A., Zamyatin D.A.).
Comments:Field name Nick-3ST-2; submitted by Victor V. Sharygin, SIGM and UrFU
   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)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Public domain photographs:
Victor V. Sharygin   

     Recommended::   (30° 45' 29"N, 57° 48' 5"E)

     This is 1 of 312 approved meteorites from Kerman, Iran
     This is 1 of 384 approved meteorites from Iran (plus 1 unapproved name)
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