Rock I.D

[maffas85]

I found these rocks on my local beach can someone please help to i.d them and are they safe for use in my tank
Thanks

1.

2.

3.

4.

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[Angus]

I'm not a geologist so consider these guesses, but the 2 on the right look like granite, the top left might be gneiss, and the lower left looks like pumace or eroded limestone, @dw1305 might have an accurate answer.

 

[maffas85]

Thanks for the reply i hope number 1 is granite as I really like the pink and red in it and would like to incorporate this into my tank

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[Tim Harrison]

Where exactly is your local beach? it would help to know if you want an ID.

P.S. I'm guessing maybe somewhere in Cornwall or Scotland?

 

[maffas85]

No its in east yorkshire hornsea to be precise

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[Kezzab]

All but the white pumice like stuff looks fine to use. Looks granite like.

 

[Tim Harrison]

Haha...I think your rocks are all igneous rocks of some description, maybe granite, and there aren't that many places in the UK that they outcrop near the coast...
The geology of the Hornsea area is predominantly sedimentary, Boulder Clay with some sands and gravels.
Anyway, yes they will be fine to use in the tank, except for the white stone which is probably some sort of heavily weathered/eroded limestone, chalk.

 

[dw1305]

Hi all,
I agree with the others, the two coarse grained pink rocks look like granite. I don't know the source of them in the N. Sea (Norway?), but they look similar in colour to the Connemara granite from W. Ireland.

I would assume that there must be a wide range of different erratics eroding out of the glacial till all along the Holderness coast, and it should be a really good place to find water worn cobbles in a range of colours.

The darker igneous rock looks like a <"Rhomb porphyry">, which would definitely make it of Norwegian origin, the large crystals are "phenocrysts".

except for the white stone which is probably some sort of heavily weathered/eroded limestone, chalk.

The fourth rock does look like pumice, but I think @Tim Harrison is right, and it is a chalk pebble that has been heavily <"bored by Piddocks etc">.

cheers Darrel

 

[maffas85]

Thank you all for your help

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[Angus]

Knew you would have an answer Darrel, i learn so much reading your posts.