Is this some kind of chert?

[penderbender]

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

[penderbender]

Haha forgot the pics...

[Zuma]

Yep. Heat helps some TX cherts.
Zuma

[Tower]

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

[penderbender]

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

[Tracker0721]

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

[nclonghunter]

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

[penderbender]

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

[nclonghunter]

If it rhyolite then heating wont help...

[Tree_Ninja]

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.

[penderbender]

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

[mullet]

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

[Chippintuff]

This is one of the best charts on heat treating.

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

WA

[penderbender]

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