Flint fragments

[doggone]

Picked up these this year, just laid on the fields - top left is jet though.

Flint doesn't occur locally here so any you find was carried almost certainly by man.
They could just be waste from making a more impressive tool, but they have sharp edges and can still function like a penknife.
Two especially do sit very nicely under your index finger for cutting or scraping.


https://i.postimg.cc/s2px6HSw/ZV101935.jpg

[Polarbear]

I saw a Time Team episode where Phil Harding did some flint napping. It was quite amazing how sharp the flint blades were.

I wouldn't have a clue if those were tools or off cuts but an interesting find.
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[MCN]

Looks awfy like the stuff that I used to top up my driveway chips.

Chert.

I found several lumps when I was working in N. Africa but that was Petrified Wood.
Where the chert/flint seeps into buried vegetable remains and is then hardened into rock.
It's a very fine grain so micro details are retained.
But the wood part of petrified wood no longer exists in petrified wood.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[Islander]

That looks like chert to me. It's still workable for tools though and being microcrystalline silica will take a demon edge. Flint is a specific type of chert associated with cretaceous chalk deposits.

ETA

Not necessarily brought there by man by the way. Glaciers transport rocks huge distances.

[doggone]

[Nobby the Bastard]

Flint and chart are the same mineral. The only difference is flint is found in nodules, chert in veins.

Flint you can dig up, chert is just a byproduct of quarrying in limestone.
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[Ayrton]

Used to do a bit of knapping when I was a teenager. It's a lot of fun, but very frustrating when something you've been working on for 30 minutes snaps in half.

This is about the best I did. Middle one is obsidian, but I cant remember what the other were. There's no knappable stone in my area so I ran out pretty quick.
https://i.imgur.com/1mvg3ot.jpg

[Islander]

[Islander]

[stinkwheel]

It looks exactly like the stuff on the path in my back garden.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.