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Photos 116 - 120 of 648
geology rock

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©  EXIF
Here's what I went to Jenner to see: eclogite. This rock type is what happens to basalt when you push it 30 kilometers down into the Earth and heat it up to around 400 C for a million years or so. It's quite rare at the Earth's surface, but a chunk of it a few hundred meters across popped up amid the rocky glop of the Franciscan subduction complex. The reddish grains are garnet and the blue groundmass is glaucophane.
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Jul 07 2005 11:40 GMT curves PRO
Heat and pressure can make for beauty
Jul 07 2005 18:26 GMT jef PRO
I have a 1-foot hunk of that stuff from that very beach.
Jul 07 2005 20:47 GMT alden PRO
That's the only place you can get it for a thousand miles in any direction.

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