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DorsetJack

Marcasite/white pyrite. There are hundreds of them all over Charmouth beach. Sometimes you can see the inner whorls of the ammonite whilst the outer parts are too far gone like yours but mostly it's a nobbly ring

The one thing you will get from breaking rocks with a hammer is a lot of broken rocks...
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fossilfin
Hello again,
 

Have really become addicted to this - my son and I found these in the woods near our house in east hants...your help once more would be appreciated!

 

1, Is the first item a pyrite nodule and should I cut it open? it is spherical, about 50mm in diameter and heavy for it's size.

 

2, Is the shell fossil rare or a common thing to find?

 

Fossfin_008.JPG 

Fossfin_003.JPG Fossfin_005.JPG  

 

Thanks-  Fossilfin
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DorsetJack
1st one looks like an over-pyritised ammonite - they are quite common around Charmouth in Dorset - but where you find those, you should be able to find recognisable ammonites.
The one thing you will get from breaking rocks with a hammer is a lot of broken rocks...
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Bas
The first photo is pyrite, i have a very similar looking 'nugget' found near dover way
 

Bas
To understand where we are going, we need to know where we have been.
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Richard


Hi
 
I agree with the others about the pyrite.
 
The second one is a bivalve fossil. It looks as though it is preserved in, and attached to, flint.
 
As to rarity, it depends where you look and how lucky you are. I would say it is not rare but not all that common either. 
Richard
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gigantopithicus
 Given the crystal structure it is likely to be Marchasite rather than pyrite - quite common as spaerical to log like lumps in the chalk.

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quagga
Yup, definitely marcasite.  I have some spherical ones, and one that looks remarkably like a large poo!
Time is nature's way of stopping everything happening at once.
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Robert B.
If the marcasite is split it will reveal a brassy-golden interior of fine radiating needle-like crystals, although this will eventually tarnish. It may take a few good blows though to split.
 

Best of luck,

 

Robs 
'A man who stares at a rock must have a lot on his mind... or nothing at all'

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