covered with crystals

Images made through a microscope. All subject types.

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Litonotus
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covered with crystals

Post by Litonotus »

simocephalus vetulus with crystals

Image
Last edited by Litonotus on Thu Jun 19, 2014 2:16 am, edited 1 time in total.
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I'm looking for the the extemely rare V-IM magnification changer for the E800 scope. If you have seen a listing or have one for sale please let me know.

vasselle
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Post by vasselle »

Very nice photo

Olympusman
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Crystals

Post by Olympusman »

I've been watching these crystal posts for some time, and the effect may be the same effect you would get if you cross-polarized a cassette or CD case. It might be stress signatures in whatever the material is that makes up the shell. Any ideas out there?
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA

Pau
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Re: Crystals

Post by Pau »

Olympusman wrote:I've been watching these crystal posts for some time, and the effect may be the same effect you would get if you cross-polarized a cassette or CD case. It might be stress signatures in whatever the material is that makes up the shell. Any ideas out there?
The colors are interference colors produced when a birrefringent material is placed between crossed polarizers, its exact shape is dependat of the total birrefringence and orientation, but the cause of that birrefirngence is a bit different: in plastic, an amorphous material, it's due to the preferent orientation of the polymer molecules when stressed*. In true birrefringent crystals (all but the ones of the cubic system) it's due to the different RI in different directions because the anisotropic ordered structure.
The crystals on the exoesqueleton are naturally birrefringent, not stressed, maybe made of calcite or aragonite.

*a nice exercice is to pull a transparent plastic between polarizers while looking
Pau

pwnell
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Post by pwnell »

Excellent.

Litonotus
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Post by Litonotus »

thank you (:

Yes, this one is taken using the CD "compensator".
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I'm looking for the the extemely rare V-IM magnification changer for the E800 scope. If you have seen a listing or have one for sale please let me know.

_Michal_
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Post by _Michal_ »

Excellent photo!
Last edited by _Michal_ on Fri Jun 20, 2014 5:24 am, edited 1 time in total.

carlos.uruguay
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Post by carlos.uruguay »

Nice!

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