Author Topic: Rock ID  (Read 2895 times)

James

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Rock ID
« on: September 21, 2015, 12:46:05 PM »
Another one I found the other day in Southern California. Found this 50 pound chunk and a few smaller pieces. Wondering if anyone has seen this one before and knows what it is.




Sinisterfrog

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Re: Rock ID
« Reply #1 on: September 21, 2015, 11:14:09 PM »
Best word I could give to description it is breciated. Where abouts in socal?

James

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Re: Rock ID
« Reply #2 on: September 21, 2015, 11:41:13 PM »
Near the Cady Mountains.

One person said a gneiss schist, but I don't really see the foliation of gneiss or the metallic luster of schist.  Although the density is fitting.  I got a 2.8 on a piece containing a variation of the minerals.

Markphoto3

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Re: Rock ID
« Reply #3 on: September 23, 2015, 03:21:33 AM »
It looks like petrified wood to me.  In fact it looks a lot like the wood that Sal found in Central Oregon.  What do you think Sal?  Mark

HeySal

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Re: Rock ID
« Reply #4 on: September 23, 2015, 04:22:54 PM »
It does resemble it - but I don't think it is.  Not sure what it is. Gonna have to blow up the pic and take a closer look. 
Sal

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HeySal

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Re: Rock ID
« Reply #5 on: September 24, 2015, 09:37:38 AM »
Blew it up as far as I could.  Doesn't look like wood.  Looks like some sort of green mineral - peridot or serpentine malachite or some such (probably a copper associate mineral) with a mix of gabbro and a little calcite or dolomite or such. 
Sal

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HeySal

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Re: Rock ID
« Reply #6 on: September 24, 2015, 09:43:52 AM »
Blew it up as far as I could.  Doesn't look like wood.  Looks like some sort of green mineral - peridot or serpentine malachite or some such (probably a copper associate mineral) with a mix of gabbro and a little calcite or dolomite or such.  Maybe a little deteriorated iron or volcanic of some sort in the mix? 
Sal

Life's Short.  Rock Hard.