What type of rock?

[IMAUDIGGER]

I'm posting this here first because it looks like it would have been desirable material for tools.
It's very hard material. I took a thin razor sharp flake and cut grooves into the steel receiver on my truck!

What type of material is this?
Was told it's high in silica and was formed under extreme pressure near the surface.

 

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[Kray Gelder]

Looks like a nice hunk of chert, maybe jasper.

 

[IMAUDIGGER]

I know I have not found any similiar rocks during my adventure hikes over the years.

Thinking it would look really good sliced and polished.
Might have to go back and see if there are any larger pieces bleeding down the hillside.

 

[arrow86]

I would say chert

 

[IMAUDIGGER]

Chert with veins of chalcedony?

 

[Quartzite Keith]

Where is it from?

 

[Kray Gelder]

If you found that out in the wild, you should go back. That looks like nice material with some value, and it definitely broke off of a larger outcrop. Good luck.

 

[ToddsPoint]

Chert is a sedimentary rock. Not much pressure involved. Forms on the bottom of oceans in limestone. That piece looks like it's loaded with cracks. Maybe a clean piece inside if you take it apart. Gary

 

[Jon Stewart]

YUP looks pretty cracked up.

 

[IMAUDIGGER]

Chert is a sedimentary rock. Not much pressure involved. Forms on the bottom of oceans in limestone. That piece looks like it's loaded with cracks. Maybe a clean piece inside if you take it apart. Gary

I'm 40 miles from the Pacific Coast (Northern California). The guy I was talking to mentioned the ocean and limestone. He said tetectonic plate movement created extreme pressure. I didn't retain much of what was said.

There is some limestone not far from where I picked this rock up.
I GPS'd the location and might check it out this summer.
Could be better specimens further up the hill. It's definately not going anywhere.

 

[dognose]

I think it looks like a form of Chlorite. Chlorite forms during the metamorphic process from clay. That would be possible in an area such as California with the tectonic plates and subduction zones.

Maybe

 

[Madmox]

I'm 40 miles from the Pacific Coast (Northern California). The guy I was talking to mentioned the ocean and limestone. He said tetectonic plate movement created extreme pressure. I didn't retain much of what was said.

There is some limestone not far from where I picked this rock up.
I GPS'd the location and might check it out this summer.
Could be better specimens further up the hill. It's definately not going anywhere.

I’m in Humboldt and that Chert is everywhere in all kinds of colors. Fairly common and since the area is uplifted from the Cascadia subduction you can find it from the beach all the way up into the mountains. Easiest way is in the creek beds because it looks really good wet.