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Author Topic: Found on a gravel bar  (Read 2906 times)

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whartongriff

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Found on a gravel bar
« on: February 10, 2020, 03:42:04 PM »
Found several 12 to 24" pieces of this in a central texas river about 45 minutes from the gulf. Diameter is about 4". Outside looks like a worn down oak log. Cut the end off with a slab saw and not sure what it is. Any ideas? Thanks. -John

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whartongriff

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Re: Found on a gravel bar
« Reply #1 on: February 25, 2020, 05:33:35 AM »
It's been identified! Calcite limb cast.

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irockhound

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Re: Found on a gravel bar
« Reply #2 on: February 25, 2020, 08:48:57 AM »
A little confused by the identification.  Are they saying that what you have is a limb cast made of Calcite?  It is clearly an agate and not calcite so are they saying that it is a limb cast that replaced with calcite and then the calcite eroded and it was replaced with agate a 2nd time? 
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whartongriff

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Re: Found on a gravel bar
« Reply #3 on: February 26, 2020, 05:32:48 AM »
I was told it is a limbcast made of calcite. I don't know, I'm new to this. I don't think it is agate. It is neither transluscent or banded. After looking at pictures online, I think it is definitely a limb cast. Open to suggestions on what mineral or minerals this is composed of.

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irockhound

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Re: Found on a gravel bar
« Reply #4 on: February 26, 2020, 04:06:59 PM »
You will get mixed answers from Jasper to Agate.  Definitely not Calcite though.
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whartongriff

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Re: Found on a gravel bar
« Reply #5 on: February 26, 2020, 05:06:17 PM »
Thank you. I appreciate it.

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