ryjen
Senior Member
Posts: 56
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Post by ryjen on Oct 25, 2009 1:14:04 GMT -5
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Post by koolaid on Oct 25, 2009 6:48:19 GMT -5
Jasper would be my guess from a photo.
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Post by arappaho on Nov 7, 2009 8:18:03 GMT -5
Try rhyolite for this one.
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ryjen
Senior Member
Posts: 56
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Post by ryjen on Nov 9, 2009 0:46:13 GMT -5
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Post by arappaho on Nov 9, 2009 7:38:28 GMT -5
And how about two reasons this would be called rhyolite and not jasper.
Joe
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Post by auriculatis65 on Nov 9, 2009 9:27:14 GMT -5
One it is way to porous and rather like a lava flow!?
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Post by arappaho on Nov 9, 2009 21:12:03 GMT -5
Hey Derek,  That's what I was thinking too. The red stripes look like "flow-banding" and the grain size of the matrix rock looks too large for jasper. Best guess, Looks more like rhyo to me. Joe |
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Post by ncbbqnut on Nov 9, 2009 21:20:18 GMT -5
I agree with you, Joe. It's flow-banded rhyolite. I saw giant outcroppings of it in the Davis Mountains and Big Bend area of west Texas. Much of it was reddish to purplish-red similar to that pictured.
Keep on digging!
Dennis
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ryjen
Senior Member
Posts: 56
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Post by ryjen on Nov 10, 2009 22:56:06 GMT -5
thanks guys. It looks like a nice steak.
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That's what I was thinking too.