Primitive Archer

Main Discussion Area => Flintknapping => Topic started by: penderbender on November 05, 2016, 02:08:52 pm

Title: Is this some kind of chert?
Post by: penderbender on November 05, 2016, 02:08:52 pm

Found some of this in a rock garden type thing in a parking lot in Victoria... most was really course grained and full of freeze cracks? They were all about fist sized. This stuff is a lot finer grained and has silver and gold specks in it. Pyrite? It percussion flakes very good. Pressure flakes not too good. It's really hard. Haha heat it maybe? Any help would be appreciated. Thanks- Brendan

Title: Re: Is this some kind of chert?
Post by: penderbender on November 05, 2016, 04:13:44 pm

Haha forgot the pics...

Title: Re: Is this some kind of chert?
Post by: Zuma on November 05, 2016, 06:58:03 pm

Yep. Heat helps some TX cherts. :)
Zuma

Title: Re: Is this some kind of chert?
Post by: Tower on November 05, 2016, 07:32:54 pm

There is a lot of creek & river gravel a round Victoria that takes heat & makes the most beautiful points

Title: Re: Is this some kind of chert?
Post by: penderbender on November 05, 2016, 08:29:28 pm

I should have mentioned Victoria b.c Canada. Cheers- Brendan 

Title: Re: Is this some kind of chert?
Post by: Tracker0721 on November 07, 2016, 02:04:39 pm

Looks like some kind of chert. Most gardening stores and landscaping places will have cherts mixed.

Title: Re: Is this some kind of chert?
Post by: nclonghunter on November 07, 2016, 03:17:38 pm

Looks like a good grade of rhyolite..... ::)

Title: Re: Is this some kind of chert?
Post by: penderbender on November 07, 2016, 09:01:38 pm

Cool thanks guys. Gonna have to keeps myself peeled for more. Any recommendations for temps/times to cook it? Cheers- Brendan

Title: Re: Is this some kind of chert?
Post by: nclonghunter on November 08, 2016, 07:38:21 pm

If it rhyolite then heating wont help...

Title: Re: Is this some kind of chert?
Post by: Tree_Ninja on November 09, 2016, 06:45:14 pm

Its not rhyolite.

  I have found some of the exact same stuff.  I call it chert. It is a crypto-crytalline Chalcedony. Not quite agate.

   I think heating will really help it.

 There are some mixed in with precious metals, copper gold etc.

 The greenish tint is most likely from copper/iron.

Title: Re: Is this some kind of chert?
Post by: penderbender on November 09, 2016, 08:29:07 pm

Thanks Jason! I didn't think it was rhyolite from what I could see online. I'll try and heat some up, see if it helps. Cheers- Brendan

Title: Re: Is this some kind of chert?
Post by: mullet on November 12, 2016, 10:04:22 pm

I have to agree with Lyman, looks like some high grade Ryolite I have.

Title: Re: Is this some kind of chert?
Post by: Chippintuff on November 13, 2016, 12:58:20 am

This is one of the best charts on heat treating.

http://www.pugetsoundknappers.com/how_to/Heat%20Treating%20Guide%20with%20Table.html

WA

Title: Re: Is this some kind of chert?
Post by: penderbender on November 13, 2016, 01:48:23 am

Great info thanks Chippintuff! Hey Eddie do you got any pics of the stuff you have? Thanks- brendan