An odd rock I've had for 30 years

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Offline JayDay

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An odd rock I've had for 30 years
« on: 13/09/2011 12:51:27 »
I've had this rock since I was a kid and was wondering what it is exactly. It looks like a quartz on the smooth side but with some smooth edges as if formed in a liquid state and the outside is very rough with an orange color.  It's pretty dense and heavy for it's size. Any clues? Thanks in advance.

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Offline RD

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An odd rock I've had for 30 years
« Reply #1 on: 13/09/2011 14:38:36 »
« Last Edit: 13/09/2011 15:02:28 by RD »

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Offline JimBob

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An odd rock I've had for 30 years
« Reply #2 on: 15/09/2011 03:21:41 »
agate

it is a banded chert deposited in layers, usually in warmer water than most cherts. The ability to differentiate from chalcedony is almost impossible without x-ray detraction or similar methods. Thus, in the field the terms can be used interchangeably unless you have a 4 sided piece of chert.
« Last Edit: 15/09/2011 03:25:54 by JimBob »
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Offline JayDay

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An odd rock I've had for 30 years
« Reply #3 on: 15/09/2011 11:37:17 »
Thanks for the replies. Is it common to find a rock like this in North Texas?

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Offline Bass

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An odd rock I've had for 30 years
« Reply #4 on: 16/09/2011 03:40:08 »
obviously some sort of cryptocrystalline quartz (chalcedony, chert, agate, jasper) and the rings indicate it grew in some sort of void.  What type of rock is exposed in the area where you found this?
Old enough to have a grandson
Slow enough to study rocks
Thirsty enough to find a pub

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Offline JayDay

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An odd rock I've had for 30 years
« Reply #5 on: 16/09/2011 08:07:47 »
I really don't remember where I even found this rock. I think it was in a creek near my house though. It was 30 years ago. lol