What are these rocks/fossils?

[pilot]

Hello Thomas, Sander and Bert.

Thanks for your answers. I don't think it is a meteorite, although when I found it I thought it might be. But is not particularly heavy and does not stick to a magnet (I understand all meteorites should do)
So "vuursteen" or flint.

Thanks again.
Greetings,
Chris.

[0dinofthenorth]

I agree, it’s not a meteorite. Where did you find this wierd piece of flint?, i've never seen it like that before.

[Editted by 0dinofthenorth on 03-09-2010 at 22:06 GMT +1]

[pilot]

Hello Thomas.

I found it in Denmark close to the rock with the rugose coral print.
It is a strange shape. I expected flint to have more sharp edges. These are, well, a little blunt, as if the outer surface is melted bij heat. The surface is very smooth.
Then again, maybe it is erosion and enviromental causes polished the rock with this result.

Greetings, Chris.

[0dinofthenorth]

Hi Chris.
I looked on the internet about flint, when I found a substance called Obsidian, here's a little about it...
Obsidian is an extrusive igneous rock that is composed mainly of the minerals feldspar and quartz. It has been used as a natural form of glass for its cutting properties since prehistoric times. Obsidian is commonly referred to as "volcanic glass". Today it is considered to be a gemstone and is used in making beautiful jewellery.
Our obsidian comes in three "flavours" depending on your requirements: black, snowflake and mahogany. The black is the beautiful, black and shiny and will produce extremely sharp edges when knapped. The snowflake is full of white "flakes" providing a beautiful finish. The mahogany coloured obsidian is a beautiful creamy brown colour.
Could this be what it is? ???


[Editted by 0dinofthenorth on 06-09-2010 at 17:10 GMT +1]

[Editted by 0dinofthenorth on 10-09-2010 at 08:30 GMT +1]

[Bram]

Flint can have all kinds of different shapes, some even resembling bones/animals. That's because flint could have formed around things like burrows, which don't have straight curves/sharp edges. When flint get's weathered by the sea, it'll get even smoother edges.

Greetings,
Bram

[pilot]

Hello Bram.

Thanks for your info about flint. Your remark that it can have different kind of shapes, sometimes boney like, confirmes to me that my rock must be flint, weathered by erosion. I also googled obsedian (as Thomas suggested it could be) wich is very nice looking. But I don,t think thats what I have.
I'll stick with flint.
Thanks again all of you for your replies.

Greetings, Chris.

[0dinofthenorth]

It's ok, maybe you could take a look at my idents too?

[Elbert]

Hi, this brownish flint is often called chert, a name that makes clear that it is not the well nown black flint wich is often found in the chalk cliffs of southern England.

greetings Bert

[pilot]

Hello Bert and Thomas.

I have never heard of chert before, so I have learned something new today (again), thanks to this forum.
Thomas, I have been looking at your idents, but to be honest, I have no idea what I am looking at. I really am a novice in this field. I hope you'll get some answers. (if you do, I'll be reading them as well!)

Greetings, Chris.

[0dinofthenorth]

Thanks!!!
Sorry I couldn't help you any more.