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480 Views 2 Replies Last post: Feb 17, 2014 9:28 PM by Tabfish RSS
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Feb 16, 2014 4:43 PM

Rock identification help please?

Hey so I love examining rocks I come across and I've always found these three very intriguing and I was wondering if anyone would be able to give me a bit more information about them?

 

Many thanks.

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  • Currently Being Moderated
    Feb 17, 2014 8:23 AM (in response to Appledrop)
    Re: Rock identification help please?

    It would be useful to have some info on the origins of these specimens; meanwhile:

     

    - 20140216_163513-1.jpg - either obsidian or similar volcanic glass (its shape being due to it being ejectamenta from a volcano), or industrial waste glass, (or, least likely, tarmac)

     

    - 20140216_163451-1.jpg - quartz; note the striations

     

    - 20140216_163418-1.jpg - lump of ironstone; possibly concretionary in nature, due to its exhibiting concentric zoning; but that can arise due to effects of ground water permeating fractures in the sandstone

     

    Mike

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  • Currently Being Moderated
    Feb 17, 2014 9:28 PM (in response to Appledrop)
    Re: Rock identification help please?

    All nice finds Appledrop, have you any more?

     

    Tabfish

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