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Author Topic: photomicrographs or other close-up pictures  (Read 76336 times)

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Offline finch68

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photomicrographs or other close-up pictures
« on: January 22, 2010, 11:39:25 PM »
Well, on a different thread I suggested that perhaps a thread for magnified pictures of gold, rocks, minerals, or anything else that might be of interest to gold folk might be appropriate.  Since nobody said "no", here goes.

Here is another picture of my unknown non-magnetic black stuff.



Here is a pic of a typical field in my lowest magnification



Here is a garnet fragment



Here is a gold flake with quartz clinging to it - a little hard to see in the photomicrograph, but obvious through the eyepieces



Here is a beautiful little crystal of quartz.  Most of the quartz I see is just a fragment.  Once in a while however a tiny crystal shows up.  Quartz crystals are six-sided prisms with pyramid shaped ends.  This one is classic.



Enjoy!  Want more?

finch68

Offline fatkat

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Re: photomicrographs or other close-up pictures
« Reply #1 on: January 23, 2010, 04:52:27 AM »
this is a recrystalised grain of gold errode from the trassic of the uk midlands ..size is approx 0.2mm

will see if I've a lower mag image and resize it

location charnwood forest liecestershire  uk nr. Grace Dieu priory

Offline PlacerPal

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Re: photomicrographs or other close-up pictures
« Reply #2 on: January 23, 2010, 06:29:12 AM »
More photos please. Rare that we can have such an good educational experience!
Thanks too for sharing your resources.

 :)

Offline GPEX admin

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Re: photomicrographs or other close-up pictures
« Reply #3 on: January 23, 2010, 08:49:40 AM »
A most interesting thread.... one that's destined to build.

Suggestion.... for each microphoto, it would surely serve if the (general) location of acquisition was identified (by example - -Upper Fraser River, BC; 15 Mile Stream, NS; etc), and, at what magnification was used for the photos.
Somebody said that it couldn't be done
But he with a chuckle replied
That maybe it couldn't but he wouldn't be one
Who'd say so until he had tried.

Offline finch68

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Re: photomicrographs or other close-up pictures
« Reply #4 on: January 23, 2010, 09:46:07 AM »
Good suggestion Larry:

All of the photos I have posted were of material taken from the Fraser River various places south of Yale

As for magnification, I include a scale bar somewhere in each photo to give an idea of the size of the particles.  All units on the scale bar will be in microns unless I indicate otherwise.  "Magnification" as such is not really useful as everyone has a different screen size and resolution.  If I simply say the magnification is 150X it is not really helpful if you are looking at the image on a 10" screen compared to a 24" screen.  But by showing the scale bar you an immediately tell how large objects in the photo are no matter what screen you have.

finch68

Offline Blister

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Re: photomicrographs or other close-up pictures
« Reply #5 on: January 23, 2010, 10:08:04 AM »
 This isn't even close to the quality of Finchs shots
 Its  + 50 mesh  shot at 20x optical plus 4x digital zoom with a hand held camera.
 I believe it came from, about an hour south of Revelstoke.

 [ Invalid Attachment ]

Offline Greg in BC

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Re: photomicrographs or other close-up pictures
« Reply #6 on: January 24, 2010, 09:29:32 AM »
Excellent thread and thanks for the pics Finch, please continue as it is a very interesting subject.  What type of microscope do you use?

I have a pic of local gold I'll dig up and post.

Offline muconium

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Re: photomicrographs or other close-up pictures
« Reply #7 on: January 24, 2010, 09:53:36 AM »
WOW! This kind of thread really gets my blood pumping, finch! Half the fun of gold/gem prospecting (for me) is just looking at my collection, and buying some kind of microscope to do it with has been on my wishlist for quite some time....

I have had bookmarked a link to a post by vikingsniper. He had posted micro-pics of black sand and gold, but it looks like the pics he posted have been removed... Nevertheless, here is a youtube link showing the device he uses to take his photos. Maybe it will give some of you ideas:


      YouTube
            - Dino-Lite USB Handheld Digital Microscope
   
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Offline muconium

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Rusty dirt makes me drool.

Offline fatkat

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Re: photomicrographs or other close-up pictures
« Reply #9 on: January 24, 2010, 11:59:45 AM »
hers a clearer pic of the one above  plus two more from the same location ...these were all taken at aprox 60x mag  then slightly enlarged in photo shop all are in the 0.2mm dia range
the usb microscope is a very cheapo one from Aldi   but the lower mag pics are quite acceptable

 


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