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Rock ID please.

  • 10-04-2018 2:41pm
    #1
    Cul a cnoic
    Registered Users, Registered Users 2 Posts: 653 ✭✭✭


    Hi,

    I have no idea as to what this rock is, a friend found it on his land which runs to the sea shore. It is about 2ft long and appears pitted \ erroded.

    Any help in identifying it would be much appreciated.

    Many thanks.


    Image 1 here http://postimage.org/image/yg4luixrx/

    image 2 here http://postimage.org/image/uwio4pncd/


Comments

  • #2
    slowburner
    Moderators, Science, Health & Environment Moderators Posts: 5,221 Mod ✭✭✭✭slowburner


    If it feels comparatively light in weight, then it's probably a volcanic tuff


  • #3
    tabby aspreme
    Registered Users, Registered Users 2 Posts: 4,034 ✭✭✭tabby aspreme


    Anyone know what this is , it looks like a big lump of tarmac, but it's not, most of the stones around here are granite


  • #4
    slowburner
    Moderators, Science, Health & Environment Moderators Posts: 5,221 Mod ✭✭✭✭slowburner


    tabby aspreme wrote: »
    Anyone know what this is , it looks like a big lump of tarmac, but it's not, most of the stones around here are granite

    It's quite difficult to see from the photos but it looks to me a little like a 'smithing hearth cake' but I am not seeing the usual oxidised iron. Smithing hearth cakes were a by-product of medieval and post-medieval iron smelting furnaces. They are a conglomerate of waste, often heat affected stone (usually bog ore) cemented together with partially smelted iron.
    Was it sitting on the surface or dug up recently?
    Does it feel metallic?


  • #5
    tabby aspreme
    Registered Users, Registered Users 2 Posts: 4,034 ✭✭✭tabby aspreme


    It was level with the surface, with a layer of grass covering it. I first pulled it up when ripping for forestry in 2010 and it's been there since, there is still clay on it so I cannot say if it feels metallic, but I will try a magnet on it, it would not be as heavy as a similar sized granite stone, it's approximately 60/45/30 cm.


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