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NWA 4560 (LL3.1) - 6.72g Complete Slice

Northwest Africa 4560 (NWA 4560) was found in the Sahara Desert in Northwest Africa in June, 2006. Five stones totalling 900g were found with a varnished crust which displayed inclusions and an obvious chondrule-rich interior. NWA 4560 was originally classified as an LL3.7 but after further extensive studies it was found that this meteorite is actually an extremely unequilibrated LL3.1 while the Shock Rating is S2 and the Weathering Level is W2. The five stones were all slightly different and the specimen below was taken from a brecciated 'dual lithology' stone which has two very distinct halves. NWA 4560 also shares some remarkable similarities with NWA 3119. The specimen below is part of the Meteorites Australia Collection (MA.07.0003).

Lithology 1: (Left in first image) has fewer chondrules and much more of the orange/yellow interstitial matrix. The chondrules also appear to be slightly more equilibrated than the other lithology and there are more chondrule fragments. There is a fragmented Bleached Chondrule in the centre of the first image on the border of the two halves. The metal in this half is in slightly larger grains/clumps than the other and Troilite (FeS) is also much more plentiful.

Lithology 2: (Right in first image) has more defined crisp chondrules with is set in a darker but hardly noticeable matrix. In fact, most of what appears to be matrix between the larger chondrules are primarily tiny chondrules. Metal is also finer and distributed more evenly although there is a relatively large armoured chondrule towards the bottom centre edge.

NWA 4560 (LL3.1, S2, W2) - 6.72g Complete Slice
NWA 4560 (LL3.1) - 6.72g Complete Slice.

Enlargement ---> 1200 x 991 (493KB)

NWA 4560 (LL3.1, S2, W2) - 6.72g Complete Slice
NWA 4560 (LL3.1) - 6.72g Complete Slice.

Enlargement ---> 1200 x 998 (524KB)

NWA 4560 (LL3.1, S2, W2) - 6.72g Complete Slice
NWA 4560 (LL3.1) - 6.72g Complete Slice. (Annotated Image)

Enlargement ---> 1200 x 991 (500KB)


 

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