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1497 Views 17 Replies Last post: Apr 28, 2014 1:28 PM by Donna B RSS
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Apr 20, 2014 3:47 PM

My Son thinks he has found a diamond?

Whilst out fossil hunting yesterday in our local river bed my little boy came across a small (under 1cm) chunk of what looks like crystal or glass, I know there is little chance of this actually turning out to be a diamond but he is only 8 with a brilliant imagination and I promised him I would ask an expert just to make sure it is not the find of the century It was found in the river bed of the river Annick, Ayrshire, SW Scotland if it helps. I have tried my best to take macro shots using a jewellers loupe light to backlight.SAM_0719.JPGSAM_0722.JPGSAM_0713.JPGSAM_0715.JPG

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    Apr 20, 2014 9:03 PM (in response to Donna B)
    Re: My Son thinks he has found a diamond?

    Donna's son,

     

    Well done for looking.

    Well done for noticing something interesting.

    It is not a diamond, sorry!

     

    It is probably calcite (a form of calcium carbonate), probably from a vein in the rock.

    One the the things that tells me that is the chevron marks (second photo). They show what is called crystallographic twinning - which is fairly unusual.

     

    Calcite can occur in many different forms, some of which are shown here

    - http://www.mineralatlas.com/mineral%20photos/C/calcite2cp.htm

    (search the page for 'Marchienne' and you'll see twinning a bit like yours).

     

    Keep looking, because you never know what you might find!

     

    Mike

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        Apr 21, 2014 5:49 AM (in response to Donna B)
        Re: My Son thinks he has found a diamond?

        Hi Donna,

         

        I hope little Leon's curiosity leads him to find much more treasure, in whatever form, and continues to give you so much joy in so doing. You watch him grow and beam with delight at 'specials' of the things that interest him, but you know not where it will lead him; into what and whom he might grow; on what journey he may take you both. May it be a happy and prosperous one.

         

        Mike

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    Apr 25, 2014 12:13 AM (in response to Donna B)
    Re: My Son thinks he has found a diamond?

    hi

    Looks interesting

    Just in case its something other than calcite, try Mohs Hardness test  ....  calcite is  V Soft  H=3

    could e Byrite (which is soft but v heavy)

    Quartz scratches  glass  = ie if it scratches glass then its harder than 6   and makes it way more intresting a

    ie Zircon Topaz beryl etc.....

     

    p.s. when scratching glass make sure the glass is REALLY scratched not the sample not the mineral leaving a mark  (meaning its softer ) i used a window

     

    See also minerals of scotland

    http://www.curriehj.freeserve.co.uk/agates.htm

     

     

    Mohs hardness Mineral Chemical formula Absolute hardness Image
    1TalcMg3Si4O10(OH)21Talc block.jpg
    2GypsumCaSO4·2H2O3Gypse Arignac.jpg
    3CalciteCaCO39Calcite-sample2.jpg
    4FluoriteCaF221Fluorite with Iron Pyrite.jpg
    5ApatiteCa5(PO4)3(OH,Cl,F)48Apatite crystals.jpg
    6FeldsparKAlSi3O872OrthoclaseBresil.jpg
    7QuartzSiO2100Quartz Brésil.jpg
    8TopazAl2SiO4(OH,F)2200Topaz cut.jpg
    9CorundumAl2O3400Cut Ruby.jpg
    10DiamondC1600Rough diamond.jpg
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        Apr 25, 2014 11:21 AM (in response to Donna B)
        Re: My Son thinks he has found a diamond?

        ok then its Not calcite!

        Its doesnt look lke calcite as pure crystal calcite (clear calcite ) wears v fast and has v good clevage so that breaks up etc...

        If it definitly scratches glass then it still could be crystalline Quartz!  but it does have the chevrons found in  roughdiamond l! your son is right!  He sounds like me as a kid i was mad for collecting ... minerals fossills but livedin London were there a v few minerals. Gypsum, Barite, selenite, pyrite.....

         

        There has been  DIAMOND found  IN SCOTLAND ?! but as far as i know they are very  very small ( microscopic)    Sapphire, Corundom, topaz, zircon, spinel etc...have all been found... Gold is also common  if he has a gold pan or sluice ledhills have a place u can try it with all the gear...  any way without further tests?  try a good jeweller /gemmologist might help ?

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          Apr 25, 2014 11:49 AM (in response to brettarcher)
          Re: My Son thinks he has found a diamond?

          Agreed - too hard for calcite.

          Quartz is now the most-likely ID (it can show twinning).

           

          I suggest finding yourself a piece of quartz to carry with you as part of your field equipment. You can then test specimens for hardness in the field.

          You can also test this specimen - to see if it is something harder and hence more interesting than quartz.

           

          Mike

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              Apr 25, 2014 6:26 PM (in response to Donna B)
              Re: My Son thinks he has found a diamond?

              looks more like quartz crystal  !? 

              what is the area called were it was found ?

              is it Metamorphic ? volcanioc? sedimentary etc...

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              Apr 25, 2014 8:58 PM (in response to Donna B)
              Re: My Son thinks he has found a diamond?

              Donna,

               

              It is curious how that last lot of photos make the same specimen look much more glassy - more quartz-like In those photos, I can now see some more of what looked like twinning - only now, in the new light, I think they are staggered growth lines. Those occur where you have one crystal growing against another, somewhat side-by-side, and sometimes A grows faster than B, other times vice versa.

               

              All you wanted to know about quartz, and probably more

              - http://www.mindat.org/min-3337.html

              ...Except whether your specimen is it!


              Going to the jeweller...

              You go ahead and feel silly if you want: they can't touch you for it!

               

              Mike

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                  Apr 28, 2014 7:38 AM (in response to Donna B)
                  Re: My Son thinks he has found a diamond?

                  Hi Donna,

                   

                  Well that is useful to know, only in a stream bed in Scotland, there is always a good chance a stone will have been imported from a different geological terrain through being washed downstream and/or brought into the area by glaciation.

                   

                  Keep us posted.

                   

                  Mike

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                      Apr 28, 2014 11:29 AM (in response to Donna B)
                      Re: My Son thinks he has found a diamond?

                      Thanks Donna,

                       

                      Interesting. I note the parallel-sided veins at left and bottom of top photo - almost strangely consistent in width...

                      But the clear crystal vein (probably quartz) is more in-keeping with septarian nodule.

                       

                      If you get much more into geology, you might want to consider getting access to a rock saw and grinding/polishing machine. You'll see a lot more in sawn and polished surfaces. (Varnished is cheaper and quicker than polished, but not as high a quality.) If there is a local geology club, they might have such equipment.

                       

                      Mike

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