What kind of rock is this?

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Offline joel08

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What kind of rock is this?
« on: 20/06/2009 00:37:29 »
Hello everyone, found this one on the beach.  Never seen a rock like this before.  The outside is rough metal-like, and the inside looks like glass-caramel.  I found it in Bathurst, NB, Canada.  What do you guys think?
















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Offline JimBob

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What kind of rock is this?
« Reply #1 on: 20/06/2009 03:13:23 »
Chert, I do believe.
The mind is like a parachute. It works best when open.  -- A. Einstein

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Offline joel08

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What kind of rock is this?
« Reply #2 on: 20/06/2009 04:07:54 »
Forgot to mention, click on the photos for a closer look.

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Offline Chemistry4me

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What kind of rock is this?
« Reply #3 on: 20/06/2009 04:14:03 »
JimBob is the geologist, he is the man.

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Offline Bass

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What kind of rock is this?
« Reply #4 on: 20/06/2009 06:03:20 »
I agree with "the man"
Old enough to have a grandson
Slow enough to study rocks
Thirsty enough to find a pub

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Offline joel08

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What kind of rock is this?
« Reply #5 on: 20/06/2009 16:13:40 »
Great!  Thanks Jimbob

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Offline JimBob

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What kind of rock is this?
« Reply #6 on: 20/06/2009 17:32:10 »
Bass is also the a geologist - please do not neglect him (even if he is a survivalist recluse in the mountains of Montana.)
The mind is like a parachute. It works best when open.  -- A. Einstein

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Offline BLUE DOG

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What kind of rock is this?
« Reply #7 on: 05/07/2009 10:25:39 »
chert,yes plausible
i took a closer look at your rock and it does appear to be cryptocrystaline
does this rock feel weighty? if yes then chert it would be.
however if it feels quite light then it maybe bio-genic opal which also forms much the same way as chert.

i have notice from one of the photos that your rock has a rhine or husk on the outer edge as well as conchiodal fracturing, typical of chert and bio-genic opal

BLUE DOG
AUSTRALIA

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Offline JimBob

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What kind of rock is this?
« Reply #8 on: 14/07/2009 15:59:59 »
An opal wouldn't survive long enough on the beach where this came from. They are soluble - however slightly - in salt water; solubility increasing as water temperature increases.
The mind is like a parachute. It works best when open.  -- A. Einstein

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Offline traveler

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What kind of rock is this?
« Reply #9 on: 20/07/2009 13:24:56 »
Anyone for Carnelian? Another version of SiO2.

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Offline JimBob

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What kind of rock is this?
« Reply #10 on: 21/07/2009 15:20:33 »
No, not me
The mind is like a parachute. It works best when open.  -- A. Einstein