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Are you sure it's rock? Depending where you are in France it may be molten metal made hard in cooling. Lots of ex battle fields all over France.
Im pretty sure it is not natural rock , as you say it could be molten metal , l had a good look at the point where l tried to grind it and it is quite shiny.
 
Can any "rockologists" tell me what this is. lt surfaced when l was digging in our veg plot .Its quite heavy considering that it seems porous . I tried to cut into it with my bench grinder but it just bounced off with a high pitched "ping" . My first thought was that it was volcanic but l am not aware that there has ever been volcanic activity in SW France.
View attachment 617762

It is 9cm long and weighs 110gr.

That's slag from ferrous metal. Should be attractive to a magnet.

Maybe there was a forge somewhere nearby at some point?
 

oldwheels

Legendary Member
Location
Isle of Mull
Got another nice run on the trike before the rain started.
Got to a T junction and the wind was blowing down Loch Etive so went down that way and then wind behind me on the way back. Particularly helpful up Queen's Brae where I was doing 2.2mph uphill so any push is welcome.
Did turn on my bike camera so got some nice pics.
Not much traffic on a Sunday at this time of year and they all gave me plenty of space but not one acknowledged that I stopped to let them pass. On Mull the locals all give me a flash of the hazards.
One of the annoying things about the Akaso Brave 4 camera I have is that it resets the date and time to 2000 and some random time which is a nuisance having to reset before every use.
 

classic33

Leg End Member
Can any "rockologists" tell me what this is. lt surfaced when l was digging in our veg plot .Its quite heavy considering that it seems porous . I tried to cut into it with my bench grinder but it just bounced off with a high pitched "ping" . My first thought was that it was volcanic but l am not aware that there has ever been volcanic activity in SW France.
View attachment 617762

It is 9cm long and weighs 110gr.
Bomb casing that's had time to rust, after burning.

As for volcanic activity in SW France
https://www.volcanodiscovery.com/chainedespuys.html
 

deptfordmarmoset

Full time tea drinker
Location
Armonmy Way
I've been to Suffolk, where I got exceedingly muddy. I'm now home again and about to taste my first coffee of the day.
 
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