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Author Topic: Rock ID  (Read 1716 times)

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Offline bushman

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Rock ID
« on: July 14, 2011, 01:31:24 am »
Here are a few pictures of the type of rock that the natives used for their stone tools, I have just found out that they use to get it a few hours from were I live. I was wondering if anyone knows what type of rock it is? I have been told that it is basalt by a few people but someone else tried to tell me its obsidian but I don’t think it is, I have never seen obsidian that looks like that before. Thanks.
Bushman





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Offline Tower

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Re: Rock ID
« Reply #1 on: July 14, 2011, 01:44:02 am »
I'm sorry I don't know for sure. There are others on this site that have been around the knapping world. I think it could be basalt or rhyolite. But both aren't too common here in TX.
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Offline Newbow

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Re: Rock ID
« Reply #2 on: July 14, 2011, 02:05:29 am »
Looks an awful lot like dacite to me.
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Offline Tower

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Re: Rock ID
« Reply #3 on: July 14, 2011, 02:17:33 am »
Newbow, you could be right. There's not much of it here either. Does dacite have inclusions or is it grainy. I've knapped a few pieces but maybe they were Top Shelf . I'm not contradicting only asking . I'm good with TX material but at a loss to most others.
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Offline Newbow

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Re: Rock ID
« Reply #4 on: July 14, 2011, 04:07:07 am »
The only dacite I have worked comes from near Glass Buttes in central Oregon.  It is generally less grainy than the closeup photo shows and has few inclusions; just the odd ash pocket on occation.  Having said that, it still looks like dacite.  Other than being less grainy, I have some in my shed that look just like those pictured.
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Offline jamie

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Re: Rock ID
« Reply #5 on: July 14, 2011, 06:43:41 am »
thats basalt . love the stuff. if you have a good source for it let me know. been looking a long time for some more.
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Offline JEB

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Re: Rock ID
« Reply #6 on: July 14, 2011, 08:50:52 am »
Hornstone??
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Offline mullet

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Re: Rock ID
« Reply #7 on: July 14, 2011, 09:23:09 am »
That looks like a high grade Basalt or low grade Dacite to me. I've gotten both from west Texas before.
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Offline bushman

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Re: Rock ID
« Reply #8 on: July 29, 2011, 03:41:29 am »
Thanks for the replies.
Bushman
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