Search found 401 matches

by Linden.g
Thu May 21, 2020 6:48 am
Forum: Photography Through the Microscope
Topic: Rough Diamonds
Replies: 20
Views: 2009

Love the interference rings
by Linden.g
Wed May 20, 2020 1:31 pm
Forum: Photography Through the Microscope
Topic: Rough Diamonds
Replies: 20
Views: 2009

Those are lovely David. I really like the detail showing the "trigons" and surface growth plates.
by Linden.g
Tue May 12, 2020 6:38 am
Forum: Photography Through the Microscope
Topic: Natural diamonds, cross polarized light (black diamond add)
Replies: 21
Views: 2985

Black diamond

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by Linden.g
Mon May 11, 2020 7:38 pm
Forum: Photography Through the Microscope
Topic: Natural diamonds, cross polarized light (black diamond add)
Replies: 21
Views: 2985

A different batch of diamonds

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by Linden.g
Sat May 09, 2020 9:51 am
Forum: Photography Through the Microscope
Topic: Natural diamonds, cross polarized light (black diamond add)
Replies: 21
Views: 2985

Sumguy01 wrote::smt038 Very nice.
Thanks for sharing.
Thanks, this one is really complex

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by Linden.g
Sat May 09, 2020 5:54 am
Forum: Photography Through the Microscope
Topic: Natural diamonds, cross polarized light (black diamond add)
Replies: 21
Views: 2985

Given the color of the background, a 1/4 Lambda plate was used. A Lambda plate would produce a bright magenta background-color. When I say a Lambda, I really mean a home made phase plate out of plastic. I also rotated the top polarizer slightly as it transitioned from magenta to green and found a m...
by Linden.g
Sat May 09, 2020 5:50 am
Forum: Photography Through the Microscope
Topic: Natural diamonds, cross polarized light (black diamond add)
Replies: 21
Views: 2985

Nice photos . This strain birefringence is normal in diamonds. How big are these crystals? Diamonds are one of my favorite minerals to look at. In particular, their surfaces can be quite spectacular using epi DIC microscopy. Nathan, they are about 0.5 mm across This example is a flatter crystal htt...
by Linden.g
Fri May 08, 2020 12:15 pm
Forum: Photography Through the Microscope
Topic: Natural diamonds, cross polarized light (black diamond add)
Replies: 21
Views: 2985

Thank you for the appreciation, feedback and references. The birefringence is very weak under plan cross polarization. The crystals grow under extreme condition so perhaps its not too surprising they are highly internally stressed.
by Linden.g
Fri May 08, 2020 9:19 am
Forum: Photography Through the Microscope
Topic: Natural diamonds, cross polarized light (black diamond add)
Replies: 21
Views: 2985

houstontx wrote:awesome, what was the source of the diamonds? Were these for cutting/grinding? Love all of them, too bad about that inclusion on the first one :evil:
Thanks so much, they were bought on ebay and were listed as GH White colour VS clarity. Use wasn't specified.
by Linden.g
Fri May 08, 2020 8:48 am
Forum: Photography Through the Microscope
Topic: Natural diamonds, cross polarized light (black diamond add)
Replies: 21
Views: 2985

Natural diamonds, cross polarized light (black diamond add)

I was very surprised by the intensity of the birefringence in these natural micro diamond crystals. The colours could only be seen with an extra lambda plate. All images were focus stacks using an Olympus S-plan Apo 10x except for the stereograms which were S-plan 4x. http://www.photomacrography.net...
by Linden.g
Fri May 01, 2020 6:03 am
Forum: Photography Through the Microscope
Topic: Quartz crystal with petroleum inclusions
Replies: 6
Views: 1208

Thanks Pau
by Linden.g
Fri May 01, 2020 4:53 am
Forum: Photography Through the Microscope
Topic: Quartz crystal with petroleum inclusions
Replies: 6
Views: 1208

Two more examples. The last one showing much more diffuse structures.

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by Linden.g
Thu Apr 30, 2020 5:09 am
Forum: Photography Through the Microscope
Topic: Quartz crystal with petroleum inclusions
Replies: 6
Views: 1208

Thanks you. This inclusion is incredibly complex.


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by Linden.g
Wed Apr 29, 2020 6:31 pm
Forum: Photography Through the Microscope
Topic: Quartz crystal with petroleum inclusions
Replies: 6
Views: 1208

Quartz crystal with petroleum inclusions

I love these petroleum enhydros quartz crystals. They contain inclusions of petroleum liquid, bitumen and bubbles of methane gas. The first imaged used an Olympus Splan Fl 2x, the second, an Olympus Splan 4x. Both were lit with dark field ring lighting in combination with cross polarized light. The ...
by Linden.g
Mon Apr 13, 2020 8:09 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Optimized Condenser-less dark field LED lighting
Replies: 13
Views: 3106

I thought the Moiré pattern in these overlapping diatoms was interesting. 100% crop using Splan Apo 40x NA 0.95 with LED darkfield.

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