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Author Topic: what rock is this?  (Read 3359 times)

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Offline le0n

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what rock is this?
« on: April 19, 2016, 09:51:45 pm »
i picked one piece up from a rock shop in Marfa, Tx.

the shop owner didn't know what it was. he even questioned if it was synthetic.

it looked knappable, so i brought it back with me.











in the sunlight, it looks sort of like gray plastic.

thanks in advance.
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Offline turbo

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Re: what rock is this?
« Reply #1 on: April 19, 2016, 11:47:16 pm »
The second picture onward look like Novaculite to my eyes.
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Offline le0n

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Re: what rock is this?
« Reply #2 on: April 19, 2016, 11:59:26 pm »
^^ Thanks.

It knaps like dacite, but those red veins just come apart when you look at them.

I tried to get some vein-free flakes, but it just wasn't happening. I'll most likely just leave it alone and focus my time elsewhere.

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Offline caveman2533

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Re: what rock is this?
« Reply #3 on: April 20, 2016, 09:02:12 am »
It looks like grey novaculite to me also.
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Offline JoJoDapyro

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Re: what rock is this?
« Reply #4 on: April 20, 2016, 10:06:55 am »
Looks like a good time!
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If you always do what you always did you'll always get what you always got.
27 inch draw, right handed. Bow building and Knapping.

Offline le0n

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Re: what rock is this?
« Reply #5 on: April 20, 2016, 10:40:47 am »
^^ thanks.

i can get small flakes/points from it, so i may save it for when i'm really rock poor.
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Offline JoJoDapyro

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Re: what rock is this?
« Reply #6 on: April 20, 2016, 10:59:51 am »
I'm always rock poor, so I would already have it destroyed.  ;D
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If you always do what you always did you'll always get what you always got.
27 inch draw, right handed. Bow building and Knapping.

Offline crooketarrow

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Re: what rock is this?
« Reply #7 on: April 20, 2016, 09:16:41 pm »
   Those cracks are from water and freezing some where through time.
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Offline Tower

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Re: what rock is this?
« Reply #8 on: April 20, 2016, 11:23:41 pm »
That's TX Chert. 
It's a variant of Edwards.   It should take heat very well. 
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Offline le0n

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Re: what rock is this?
« Reply #9 on: April 21, 2016, 02:15:29 am »
Quote from: Tower on April 20, 2016, 11:23:41 pm
That's TX Chert. 
It's a variant of Edwards.   It should take heat very well.

i just googled that and found a photo of one made from this material:


that looks exactly like the stuff 8)

thanks.
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Offline le0n

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Re: what rock is this?
« Reply #10 on: April 21, 2016, 09:57:22 pm »
instead of making a new thread, can i post another rock for identification?

i knocked a slab off of it earlier; but thinking i should probably save this stuff until i have time to treat it.

edit: after searching around online, it appears to be a rhyolite. if so, i don't have to wait to heat treat it, hah hah.





i tried flaking a small chubby piece to see how it acted. it's very tough and the flakes almost fracture into powder as they run.


but the edge remains very strong and sharp.
« Last Edit: April 22, 2016, 01:03:31 am by le0n »
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