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U + A

 
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Sumguy01



Joined: 28 Jan 2013
Posts: 1378
Location: Ketchikan Alaska USA

PostPosted: Tue Mar 26, 2019 9:01 pm    Post subject: U + A Reply with quote

Urea + Alum dissolved in vinegar, fast dry in oven, no cover glass, 4x and 10x obj. polarized with retarder, # 4 is Zerene Stack,






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Jacek



Joined: 02 Oct 2011
Posts: 5347
Location: Poland

PostPosted: Wed Mar 27, 2019 1:42 pm    Post subject: Reply with quote

Nice Very Happy
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https://photos.app.goo.gl/MV9IynUtBdaKkVj53
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grgh



Joined: 09 Mar 2013
Posts: 286
Location: Lancashire. UK

PostPosted: Wed Mar 27, 2019 4:06 pm    Post subject: Reply with quote

kaleidoscope springs to mind, beautiful colours.
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used to do astronomy.
and photography.
Zeiss Universal Phase contrast.
Zeiss PMII
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Robert Berdan



Joined: 18 Oct 2017
Posts: 152
Location: Calgary

PostPosted: Thu Mar 28, 2019 3:18 pm    Post subject: Nice crystals Reply with quote

Nice crystals. I have played with Urea as melts and from solutions and my samples looked very different. It is amazing how small changes to the solvent, drying condition or additions to the solution can change the shape of the crystals. Even in a single batch I see a lot of variation.

Nice photos.
RB
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Sumguy01



Joined: 28 Jan 2013
Posts: 1378
Location: Ketchikan Alaska USA

PostPosted: Thu Mar 28, 2019 11:04 pm    Post subject: Reply with quote

Very Happy Thanks for the nice comments.
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