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Francesco Moser


 			 
Hammadah al Hamra 346
Basic information	Name: Hammadah al Hamra 346
     This is an OFFICIAL meteorite name.
Abbreviation: HaH 346
Observed fall: No, but it is possible
Year found: 2019
Country: Libya
Mass: 100 kg
Classification
  history:	
Meteoritical Bulletin:  	MB 110  	(2022)  	L6
Recommended:  			L6    [explanation]

This is 1 of 13415 approved meteorites (plus 11 unapproved names) classified as L6.    [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments:	Approved 21 Feb 2021
Writeup	
Writeup from MB 110:
Hammadah al Hamra 346 (HaH 346)        29°36’29.3"N, 13°22’03.4"E

Gharyan, Libya

Find, possible fall: 2018

Classification: Ordinary chondrite (L6)

History: On 26 August 2018, a large fireball was widely seen and heard around the sparsely populated region of the southern area of the Jabal al Gharbi District of Libya. Hundreds of freshly fusion crusted stones, totaling over 100 kg, were found in early 2019, scattered over several kilometers, about 95 km southwest of Ash Shuwayrif by Mr. Belal. S. Omar Aliby (and other meteorite hunters) who visited the site. The fusion crust is fresh and matte black and lacks evidence of extensive wind abrasion. Given the complete lack of weathering of the stones, it is possible that they originated from the 2018 meteor seen in this region. In 2019, Mr. Marcin Cimala purchased 30 kg of the material from a meteorite dealer based in Mauretania. Stones of this possible fall are currently being traded under the name of Ghadamis.

Physical characteristics: Many individuals from about 100 g to several kg, most unbroken stones are covered by matte black fusion crust. Many stones show well-developed shallow regmaglypts. Overall, the stones are blocky. Where fusion crust is lacking, the meteorite shows a light grayish interior. Specimen are very fresh; some show very minor brownish staining of exposed metal.

Petrography: (A. Greshake, MNB; L. Garvie, ASU) The meteorite displays a recrystallized texture predominantly composed of compositionally equilibrated olivine and low-Ca pyroxene grains in some regions showing 120-degree triple junctions. Few flattened and delineated PO, BO (to 1 mm), and relict PP chondrules are present. Matrix contains plagioclase, chromite, merrillite, troilite, taenite, and kamacite. The plagioclase grain size is about 60 µm. Shock melt veins are rare, but pockets are locally present. Fe-Ni metal and troilite uniformly distributed across the polished section. Largest Fe-Ni grain ~1 mm across. Most kamacite grains are polycrystalline and contains finely dispersed sub-micron-sized troilite. Some show a complex metal-sulfide eutectic intergrowth. A few larger kamacite grains show a frosty etch and weakly developed Neumann bands. Troilite, to 0.5 mm across, is highly shocked, polycrystalline, and has a dusty appearance. Cu metal was searched for but not found.

Geochemistry: (A. Greshake, MNB) olivine: Fa23.8±0.3 (Fa23.1-24.2, n=12), low-Ca-pyroxene: Fs20.2±0.3Wo1.6±0.2 (Fs19.7-20.9Wo1.2-2.0, n=12), feldspar: An11.2±0.7Ab84.4±1.1Or4.4±0.6 (An10.7-12.4Ab82.8-85.4Or3.7-5.3, n=4)

Classification: Ordinary chondrite L6, S5, W0

Specimens: 200 g at MNB and 325 g at ASU.

Data from:
  MB110
  Table 0
  Line 0:	
State/Prov/County:	Gharyan
Place of purchase:	Mauritania
Date:	2018
Latitude:	29°36'29.3"N
Longitude:	13°22'03.4"E
Mass (g):	>100000
Pieces:	hundreds
Class:	L6
Shock stage:	S5
Weathering grade:	W0
Fayalite (mol%):	23.6
Ferrosilite (mol%):	20.1
Wollastonite (mol%):	1.6
Magnetic suscept.:	4.86
Classifier:	A. Greshake, MNB; L. Garvie, ASU
Type spec mass (g):	200
Type spec location:	MNB
Main mass:	Polandmet
Finder:	anonymous
Comments:	Submitted by Ansgar Greshake

Libia, Libia

HaH346 L6 - 390 g - (1)

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HaH346 L6 - 390 g - (1)

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