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Hammadah al Hamra 317
Basic information Name: Hammadah al Hamra 317
     This is an OFFICIAL meteorite name.
Abbreviation: HaH 317
Observed fall: No
Year found: 2001
Country: Libya
Mass:help 105 g
Classification
  history:
Meteoritical Bulletin:  MB 87  (2003)  EL4
MetBase:  v. 7.1  (2006)  EL4
Recommended:  EL4    [explanation]

This is 1 of 17 approved meteorites classified as EL4.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Writeuphelp
Writeup from MB 87:

Hammadah al Hamra 317

Libya

Found 2001 spring

Enstatite chondrite (EL4)

Two dark brown stones, a larger one of 103 g and a smaller one of 2 g were found in the Hammadah al Hamra region. Classification and mineralogy (G. Pratesi, V. Moggi Cecchi, MSP): the partly fusion-crusted stone is shield-shaped; well­defined chondrules and 50 µm sized enstatite crystals indicate petrologic type 4. Major phases are enstatite (En98.5Wo0.9), kamacite (Fe = 90.46, Ni = 7.51, Si = 0.57, P = 0.53, Co = 0.47 wt%) and troilite; other minor phases are diopside(En52.91Wo46.85) and plagioclase (An26.60) in very small grains (<5 µm). Neither niningerite nor alabandite was found. The plagioclase composition, as well as the presence of diopside, is unusual compared with other known EL chondrites. Inside the chondrules, which have an average size ranging from 600 to 1200 µm, very small rounded grains containing a calcium chloride phase (1–3 µm size) have been observed. Based on texture, mineralogy and chemistry (mainly An content of plagioclase >13 mol% and Si content of kamacite <1.9 wt%; Keil, 1968; Zhang et al., 1995) the meteorite is classified as an EL4 chondrite. Terrestrial weathering grade is rather low (W1); optical features (undulatory extinction of enstatite) indicate that the sample is weakly shocked (S3). Specimens: main mass, type specimen and thin section, MSP.

Data from:
  MB87
  Table 7
  Line 81:
Date:2001
Latitude:29°21.06'N
Longitude:11°35.58'E
Mass (g):105
Pieces:2
Class:EL4
Classifier:V. Moggi Cecchi and G. Pratesi, MSP
Type spec mass (g):105
Finder:G. Pratesi, MSP
Institutions
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 5 Mar 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 87, MAPS 38, A189-A248 (2003)
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Geography:

Libya
Coordinates:
     Recommended::   (29° 21' 4"N, 11° 35' 35"E)

Statistics:
     This is 1 of 26 approved meteorites from Ghadamis, Libya (plus 2 unapproved names)
     This is 1 of 1496 approved meteorites from Libya (plus 22 unapproved names) (plus 2 impact craters)
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