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Hammadah al Hamra meteorite (HaH 280), Hamadah al Hamra, Al Jabal al Gharbi District, Libya

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Latitude & Longitude (WGS84): 28° 28' 13'' North , 12° 58' 18'' East
Latitude & Longitude (decimal): 28.47028,12.97194
Other regions containing this locality:Northwest Africa Meteorites
Sahara Desert, North Africa
Non-native locality type:Meteorite
Meteorite Type:CK4 chondrite
Köppen climate type:BWh : Hot deserts climate

Carbonaceous chondrite (CK4; S2; W2)
Find, 2000, 26.5 kg

Twenty pieces of a single stone were recovered. In a hand lens dark chondrules are visible in a fine-grained matrix rich in silicates. The olivine is largely equilibrated (Fa 32.3), but pyroxene is more variable in composition. Cr-rich magnetite is ubiquitous, often accompanied by ilmenite and spinel exsolution lamellae. Minor sulfides include pentlandite and rare chalcopyrite. Evidence of shock is pervasive — olivine displays undulose extinction and opaque veins are frequently present. Occasional plagioclase- and pyroxene-rich CAIs with layered hercynite are present.

Hammadah al Hamra is the second-most massive of the CK (Karoonda-like) carbonaceous chondrites. The CK chondrites are distinguished, among other things, by their abundant matrix (~75 vol%) and relatively high degree of oxidation. Unlike the great majority of carbonaceous chondrites, most CK chondrites have been metamorphosed to petrologic type 4 or higher.

Mineral List

6 valid minerals.

Meteorite/Rock Types Recorded

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Bukovanská, M., Brandstätter, F. & Kurat, G. (2003) NWA 1560 (CK4/5) and NWA 1563 (CK5) — A Comparison with HaH 280 (CK4) Chondrite. Meteoritics & Planetary Science 38, supplement: p. A84. (July 2003)

Grady, M. M., Pratesi, G. & Moggi Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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