[Phys-L] Age of Zircon

[Jim Green <JMGreen@SISNA.COM>]

The U Wisconsin allegedly has a speck of zircon about 4.4 billion years
old? The size of the speck is of the order of magnitude of a couple of
human hairs.

<http://story.news.yahoo.com/news?tmpl=story&cid=624&ncid=624&e=1&u=/ap/2005
0408/ap_on_sc/oldest_object>http://story.news.yahoo.com/news?tmpl=story&cid=
624&ncid=624&e=1&u=/ap<http://story.news.yahoo.com/news?tmpl=story&cid=624&n
cid=624&e=1&u=/ap/20050408/ap_on_sc/oldest_object>/20050408/ap_on_sc/oldest_
object

Where did this speck come from? ie how was it discovered?

How do they know it is zircon?

How was its age measured???

Jim
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