|Basic information||Name: Acfer 366|
This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2002
Mass: 1456 g
This is 1 of 22 approved meteorites classified as CH3. [show all]
Search for other: Carbonaceous chondrites (type 3), CH-CB family, CH chondrites, Metal-rich meteorites, and Carbonaceous chondrites
|Comments:||Approved 3 Feb 2006|
Writeup from MB 90:
Acfer 366 26°36′56′′N, 03°56′14′′E
Acfer region, Libya
Find: November 2002
Carbonaceous chondrite (CH3)
History: A single stone weighing 1456 g was found in the Acfer region of Libya by Filiberto Ercolani (deceased 2004).
Petrography: (V. Moggi-Cecchi, A. Salvadori, and G. Pratesi, MSP) The outer surface displays a small portion of fusion crust. The stone is composed of 60 vol% lithic and crystal fragments, 20 vol% chondrules, and 30 vol% nonsilicate phases. Chondrules range from 30–300 µm with a mean apparent diameter of 90 µm. Chondrule textural types: cryptocrystalline (C) = 58%, granular olivine (GO) + granular olivine-pyroxene (GOP) = 22%, porphyritic olivine (PO) = 17%, and barred olivine (BO) = 3% (all vol%). Most of the larger chondrules are GO/GOP. Nonsilicate phases are mainly Fe,Ni metal (predominantly kamacite) and minor sulfides. The metal and sulfide grains range from 10–100 µm, are rounded to irregular in texture, and are homogeneously distributed through the meteorite, within and outside of chondrules.
Geochemistry: EPMA of chondrule olivine indicate a fairly homogeneous composition (Fo97–100; mean Fo97) although olivine in fragments has a more variable composition (Fo80–99; mean Fo95). Low-Ca pyroxene in chondrules and fragments is relatively homogenous (En93–100Wo1–5). High-Ca pyroxene is rare, occurring only in PO chondrules (Fs23.8Wo31.9). Plagioclase is found in chondrules and as angular fragments, and ranges from An80 to An100. Kamacite has a high Ni content (5–9 wt%). Sulfides are typically troilite (Ni = 1–2 wt%) although some pyrrhotite grains with Ni = 11 wt% are observed. Oxygen isotope: (I. Franchi and R. Greenwood, OU) δ17O = 1.781, δ18O = 4.610, ∆17O = −0.616 (all ‰).
Classification: Carbonaceous chondrite (CH3); S1, moderate weathering.
Specimens: A total of 30 g type specimen, one thin section, and the main mass of 1410 g are on deposit at MSP (inventory number MSP 2273).
MSP: Museo di Scienze Planetarie, Via Galcianese, 20/h, 59100 Prato, Italy; Website (institutional address; updated 27 Dec 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
|References:||Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)|
This is 1 of 415 approved meteorites from Tamanghasset, Algeria (plus 3 unapproved names) (plus 2 impact craters)
This is 1 of 711 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)
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