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Gold from the Sky
opal
laurieopal

Spent today finishing up the post show book work.  And then picked out the stones for the new rings I'm designing.  Much more fun.


Apparently, the gold and I gather the silver in the earth appear to comes from meteors.  I love the idea that "it comes from space" (heavy background music).  Actually, it will make me feel differently about the metals I work in.

Quote is from the BBC

A study from the University of Bristol looked at some of the oldest rocks on Earth, demonstrating that gold was delivered by meteorites long after their formation. Their results are published in Nature.

While the Earth was forming, iron sank to the centre of the planet, forming the core.Any precious metals in the planetary mix would have gone with this iron and concentrated in the core, leaving the mantle devoid of elements such as gold, platinum, and osmium.But this is not what we observe. In fact, the silicate mantle has up to 1,000 times more gold than anticipated.

Several reasons for this enrichment were proposed in the past, including delivery by meteorites, although until now it has not been possible to prove.By measuring isotopes in rocks that are nearly four billion years old from Greenland, the team has managed to date the gold delivery, and to relate it to an event known as the "terminal bombardment".



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