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Hammadah al Hamra 337
Basic information Name: Hammadah al Hamra 337
     This is an OFFICIAL meteorite name.
Abbreviation: HaH 337
Observed fall: No
Year found: 2001
Country: Libya
Mass:help 198 g
Meteoritical Bulletin:  MB 90  (2006)  CK4
Recommended:  CK4    [explanation]

This is 1 of 123 approved meteorites classified as CK4.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 3 Feb 2006
Writeup from MB 90:

Hammadah al Hamra 337              29°00′00′′N, 12°07′40′′E

Hammadah al Hamra region, Libya

Find: 24 February 2001

Carbonaceous chondrite (CK4)

History: A single stone weighing 198 g was found in February 2001 in the Hammadah al Hamra region of Libya by Giovanni Pratesi (MSP) during a scientific expedition.

Physical Characteristics: (V. Moggi-Cecchi, A. Salvadori, and G. Pratesi, MSP) The main mass has a dark brown external surface with fusion crust in some areas. In hand sample the chondrules are set in a dark green matrix and CAIs (up to 1 mm) are present.

Petrography: The thin section contains few chondrules (not perfectly delineated and sometimes altered) set in fine-grained matrix with several coarser-grained olivine crystals. Chondrules range from 380 to 1800 µm (mean value 700 µm on n = 25) and account for about 20% of the total volume. Chondrule textural types: POP = 72%, PO = 12%, and GOP = 16% (all vol%). Very rare and extremely altered AOIs (2 vol%) and abundant CAIs (~1 mm) are observed. Plagioclase crystals can be found in GO and PO chondrules. Metal alloys are extremely rare (<0.01 vol%). Magnetite (inside and outside chondrules) is abundant (~8 vol%). Sulfides (mainly pyrrhotite) are rare and are located in the matrix. Rare kamacite and moncheite (Pt,Pd)(Te,Bi)2 are also present.

Chemistry: (EPMA) Olivine compositions are quite homogeneous (Fo68–75; mean Fo74), with the exception of rare zoned olivine crystals (Fo68–93) in PO chondrules. Low-Ca pyroxenes in GOP chondrules are En90-100. High-Ca pyroxenes in POP chondrules have an augitic composition (Wo50En50–60Fs0–10). Plagioclase and devitrified mesostasis is albitic (An25–50). Magnetite (Cr2O3 = 2–3 wt%): Sulfides (Ni = 1–2 wt%); kamacite with low Ni.
Oxygen isotope: (I. Franchi, R. Greenwood, OU) δ17O = −3.668, δ18O = −0.369, ∆17O = −3.496 (all ‰).

Classification: Carbonaceous chondrite (CK4); S1, moderate to extensive weathering.

Specimens: The main mass (174 g), a 24 g type specimen, and two thin sections are on deposit at MSP (inventory number MSP 1592).

Data from:
  Table 1
  Line 6:
State/Prov/County:Hammada al Hamra
Date:24 Feb 2001
Mass (g):198
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:  
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 22 Oct 2022)
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)
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     Recommended::   (29° 29' 0"N, 12° 7' 24"E)

     This is 1 of 214 approved meteorites from Gharyan, Libya (plus 16 unapproved names)
     This is 1 of 1539 approved meteorites from Libya (plus 23 unapproved names) (plus 2 impact craters)
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