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<p>[QUOTE=&quot;TypeCoin971793, post: 3406482, member: 78244&quot;]I just bought this, and it is one of the oldest objects known to man. It is a portion of the Muonionalusta meteorite, which impacted Earth about 1 million years ago. The octahedrite pattern you see is formed only when a Iron-nickel alloy is cooled from planetary core temperatures to ~300°C at a rate of around 1°C per 1000 years. Lead isotope dating says that this metal reached the ~300°C point about 4.5653 BILLION years ago, or about 15 million years before the Earth was even formed.</p><p><br /></p><p>This metal was from the 50-110 km radius core of a planetoid formed during the early formation of our system. For some unknown reason, this planetoid failed and broke apart, and its core spent the next 4 billion years in orbit around the sun. Using cosmic ray data analysis, we know that the metal core broke apart about 400 million years ago, with one of the fragments impacting the earth in Sweeden/Finland. It became exposed via glacier activity over the course of 4 ice ages and was discovered by a young boy in 1906. Fragments are still being found by Sweedish metal detector enthusiats, making them very common and affordable.</p><p><br /></p><p>For more info:</p><p><br /></p><p><a href="https://www.evilmadscientist.com/2014/muonionalusta/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.evilmadscientist.com/2014/muonionalusta/" rel="nofollow">https://www.evilmadscientist.com/2014/muonionalusta/</a></p><p><br /></p><p>[ATTACH=full]904532[/ATTACH] [ATTACH=full]904533[/ATTACH]</p><p><br /></p><p>I’m currently looking into meteorites formed during the era when our solar system was still just a nebula created by a supernova. These are <i>only</i> 3 million years older than this meteorite.[/QUOTE]</p><p><br /></p>

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