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Acfer 374
Basic information Name: Acfer 374
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2002
Country: Algeria
Mass:help 118 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  CO3
Recommended:  CO3    [explanation]

This is 1 of 515 approved meteorites classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 3 Feb 2006
Writeuphelp
Writeup from MB 90:

Acfer 374             26°36′52′′N, 04°03′18′′E

Acfer region, Libya

Find: November 2002

Carbonaceous chondrite (CO3)

History: Seven small fragments, weighing 118 g in total, were found in the Acfer area of Libya by an Italian dealer. The largest mass weighs 30 g.

Physical Characteristics: (V. Moggi-Cecchi, A. Salvadori, and G. Pratesi, MSP) The hand specimen has an outer surface that is brown-red while the interior is darker.

Petrography: Chondrules range in size from 30 to 450 µm (mean 110 µm). Chondrules textural types: GO to GOP = 61%, PO = 17%, GOP = 12%, radial pyroxene (RP) = 4%, C = 4%, POP = 1%, and BO = 1% (all vol%). Matrix/ chondrules ratio is ~0.5. Chondrules are set in a very fine-grained matrix composed of olivine, phyllosilicates, and pyroxene. Calcium-rich, aluminum-rich inclusions (CAIs), and amoeboid olivine inclusions (AOIs) account for about 10 vol% of the meteorite. Opaque phases (6–8 vol%) include Fe,Ni alloys, troilite, pentlandite, and pyrrhotite. Rare grains of awaruite (Ni2Fe), tetrataenite (FeNi), schreibersite, and nickel phosphide are present.

Geochemistry: (SEM and EPMA) Olivine composition is variable (Fo55–99, mean Fo94, n = 26 [n refers to the number of analyses performed]), with narrow compositional ranges in type I chondrules, mainly GO (Fo95–100, mean Fo97.1) and wider in type II (Fo55–100). Mean Cr2O3 content in 10 MgO-poor olivines (FeO > 2 wt%) is 0.35 wt%. Olivine in AOIs is Fo-rich, Fo96–100. Low-Ca pyroxene is predominantly enstatite (En85–100) with different mean values for crystals in and out of chondrules (En80.4 and En96.7, respectively). POP chondrules have high-Ca pyroxenes (En62.43Wo36.58Fs0.90). Kamacite (Ni = 4–5.00, mean value 4.61 [both wt%]; Co = 0.1–1.00, mean value 0.16 [both wt%]). Oxygen isotope: (I. Franchi and R. Greenwood, OU) δ17O = -6.042, δ18O = -2.306, ∆17O = -4.843 (all ‰).

Classification: Carbonaceous chondrite (CO3); S2, minimal weathering.

Specimens: All the fragments, two polished thin sections, and the main mass of 30 g are on deposit at the MSP (inventory number MSP 2283).

Data from:
  MB90
  Table 1
  Line 3:
State/Prov/County:Algeria
Date:Nov 2002
Latitude:26°36.52'N
Longitude:04°03.18'E
Mass (g):118
Pieces:Many
Class:CO3
Classifier:V. Moggie Cecchi, A. Salvadori, and G. Pratesi (MSP)
Type spec mass (g):All
Type spec location:MSP-PO
Main mass:anonymous finder
Plots: O isotopes:  
Institutions
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 5 Mar 2014)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
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Geography:

Algeria
Coordinates:
     Recommended::   (26° 36' 31"N, 4° 3' 11"E)

Statistics:
     This is 1 of 416 approved meteorites from Tamanghasset, Algeria (plus 2 unapproved names) (plus 2 impact craters)
     This is 1 of 970 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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