Green Pebble

A couple of days ago I picked this green pebble of the beach at Cley. It caught my eye because of its colour – I have never seen one like it here in Norfolk. I’ve had a look around on the internet and in a couple of pebble books that I own but can see no reference to a green beach stone. What can it be?

I’ve seen pebbles of a similar colour in Iceland at the edge of a glacier – but they had lots of little holes in.

The soft, but definite green, is similar to the roof tiles of some 1920’s houses – I wonder if it could be a sea worn tile fragment?

Serpentine rock from Cornwall is green, but I think this is too pale?

This pebble has similar qualities to other limestone on Cley beach – I wonder what type of rock it is and where it comes from. Any ideas?

10 thoughts on “Green Pebble

  1. Lucille Eveleigh

    Hello Debbie, I’ve asked my husband an amateur geologist, not familiar to him either. If you continue to draw a blank you could send the photo to the Geology dept @ Birmingham University. Good luck Lucille


  2. Ruth Blackwell

    Is it possible this stone was covered with moss or algae for a period of time, staining it green?

  3. charltonstitcher

    Hard to know, I’m not a geologist – but it could be Olivine. Whatever’s it is, it was most certainly brought from elsewhere perhaps washed down the coast by the currents. Like you, I’d be intrigued to know. Do let us know if you find out.

  4. Sarah Waters

    hi Debbie
    I happen to have my brother-in-law here at the moment. He is Professor of geology at Southampton University. I have shown him your photo and he says the following:
    ‘This is possibly a piece of Certaceous Green Sandstone. The green colour is from the mineral glauconite which forms in shallow marine environments. This is quite a dark one. it is about 100 million years old and was formed at the height of the dinosaurs dominance of the planet. it almost certainly was washed into the sea at Hunstanton, where a thin out-crop reaches the sea, and moved along the coast by a process of long shore drift to Clay. That is why it is rounded button completely broken up into sand yet.’
    I have a photo of the bedrock he screen shot for me but I can’t copy it here so I can email if to you if it helps.
    Best wishes Sarah

    1. debbielyddon Post author

      Hi Sarah, that is fantastic! What a useful brother-in-law. That is so useful and exactly the right amount of information for a non-geologist. I’d love to see the photo – . I might need a trip along to Hunstanton to take a look. Please say thanks to your brother-in -law. Debbie


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