April 26, 2024
NWA 1058, very primitive winonaite with chondrules !!!
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NWA 1058 NWA 1058 Found 2001 Primitive achondrite Winonaite (proposed sometimes as W5 chondrite) 0.22g endcut (TKW 180g) Winonaites are composed largely of fine-grained pyroxenes , with some magnesium-rich olivine , troilite (iron sulfide), and nickel-iron metal. They strongly resemble in compositions the silicate inclusions in type IAB iron meteorites . This similarity suggests that winonaites and IAB group irons may have come from the same parent body - a partially differentiated asteroid that suffered a catastrophic impact just as it was starting to form an iron core and a silicate-rich crust. According to this idea, the impact mixed silicates into molten nickel-iron forming the IAB irons, and mixed olivine-rich residues of partial melts into unmelted silicates, forming the winonaites. Check out my other items !
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