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1429 Views 13 Replies Last post: May 7, 2014 12:44 PM by Rosiemurphy RSS
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Apr 25, 2014 6:51 PM

Another rock for id please - labradorite ?

I found another interesting rock on the local beach in Dorset - it looks like labradorite when it is wet but not sure if it is?  If anyone could id it for me please, many thanks.

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    Apr 25, 2014 9:05 PM (in response to Rosiemurphy)
    Re: Another rock for id please - labradorite ?

    Rosie,

     

    Yes - I think you're right.

    The colour and the cleavage are right, as is the general coarsely crystalline structure of the specimen.

    Nice find.

     

    Off-hand, I can't think why you'd find labradorite on a beach in Dorset naturally.

    But exotic stones occur on many a beach due to man's activities.

     

    Mike

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      Apr 25, 2014 10:22 PM (in response to MikeHardman)
      Re: Another rock for id please - labradorite ?

      Hi Mike

      I think it's an Alien!

      Try explaining that to a family of four in the middle of the Holderness coast who want you to id this fantastic rock they had just found.

      We see many rocks like this from Scotland and Scandinavia use for sea defences on a very large scale.

      As you said - due to man's activities.

       

      Tabfish

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          Apr 25, 2014 11:22 PM (in response to Rosiemurphy)
          Re: Another rock for id please - labradorite ?

          Hi Rosie

           

          On which beach did you make your find, for some bizzare reason I assumed it was the South coast, because its just 112 miles from the the most easterly point of the Devon coast  to the Lizard. I imagine over time  your find was caused by tidal drift

           

          Steve

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              Apr 26, 2014 9:37 PM (in response to Rosiemurphy)
              Re: Another rock for id please - labradorite ?

              Hi Rosie

              Took the grandson collecting on the Holderness coast this morning at Tunstall (Sand le Mere caravan park) and we came across two specimens very much like yours.

              You find these more or less all over the Holderness.

              The larger boulders weigh several tones and have multiple drill marks along there sides but because of the energy on the beach they get broken into smaller boulders.

               

              Tabfish

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                  Apr 27, 2014 9:29 PM (in response to Rosiemurphy)
                  Re: Another rock for id please - labradorite ?

                  Hi Rosie

                  The grandson loves fossiling (he is 4 and a half) and often spots things that i miss, he is a good companion and very entertaining to be with.

                  We don't usually collect minerals like this because they are imported on to the Holderness coast to be used as sea defences, they come on barges from abroad by thousands of tonnes.

                  The Holderness is a high energy beach system and it soon starts the natural proccess of wearing them down.

                  Just a quick thought though - are you hand sanding your specimen? this will take a long time, why not use a bench grinder/sander or a sandpaper barrel attachment that fits on to a Dremmel.

                  I will post an image of the barrel attachments if you need one.

                   

                  Tabfish

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                      May 1, 2014 7:26 AM (in response to Rosiemurphy)
                      Re: Another rock for id please - labradorite ?

                      Hello Rosie

                      If you are hand sanding then do-it under a running tap, the water lubricates and helps the proccess.

                      Please have a look at the images I have attached, the sanding barrels are easy to spot but the other two are diamond coated burrs (not realy expensive) used to also remove matrix.

                      One has a 3mm shaft with a 8mm ball head and the other has a 3mm shaft and a 6mm tear drop head.

                      Don't forget to use safety glasses because when things go wrong with a rotary tool they go wrong FAST!

                       

                      Tabfish

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