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Post by Jugglerguy on Feb 14, 2021 21:05:30 GMT -5
Whoa, that's a good one. I have some Bots that have banding like that, but yours is just awesome. Great pictures too.
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Benathema
has rocks in the head
God chased me down and made sure I knew He was real June 20, 2022. I've been on a Divine Mission.
Member since November 2019
Posts: 703
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Post by Benathema on Feb 14, 2021 23:37:02 GMT -5
Couple of those photos could pass as an edge look at a stack of plates in a dark room.
Really nice agate!
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Post by stephan on Feb 15, 2021 1:44:02 GMT -5
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Post by HankRocks on Feb 15, 2021 2:46:17 GMT -5
I have a couple of Choyas that display that effect, like the surface is shimmering or moving. I assume that is related to the Iris affect in certain agates.
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Post by rockpickerforever on Feb 15, 2021 5:37:00 GMT -5
Shadow or parallax is usually very tight banding that gives the illusion of movement (similar to chatoyance) when the stone is moved. Unless that agate is smaller than it appears, I don’t think it’s shadow. I don't think you can really see parallax in a still photo. Since the stone needs to be turned, you either need to have a video of it, or have it in hand. A still photo doesn't capture the illusion.
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Post by stephan on Feb 15, 2021 8:46:50 GMT -5
Shadow or parallax is usually very tight banding that gives the illusion of movement (similar to chatoyance) when the stone is moved. Unless that agate is smaller than it appears, I don’t think it’s shadow. I don't think you can really see parallax in a still photo. Since the stone needs to be turned, you either need to have a video of it, or have it in hand. A still photo doesn't capture the illusion. That is true. My aim was to show the tight banding that produces it.
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Post by stephan on Feb 15, 2021 8:55:41 GMT -5
I have a couple of Choyas that display that effect, like the surface is shimmering or moving. I assume that is related to the Iris affect in certain agates. I think they may be related. Iris agates do need to be sliced very thin, though. Additionally, it seems that a specific orientation of the chalcedony needles is required to produce diffraction. www.minsocam.org/msa/collectors_corner/arc/iris.htmI think all iris agates are also shadow agates, but not vice versa. Iris agates are quite rare.
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Post by hummingbirdstones on Feb 15, 2021 9:11:54 GMT -5
This is the only decent video I could find that actually shows parallax:
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Post by rockpickerforever on Feb 15, 2021 9:33:36 GMT -5
I don't think you can really see parallax in a still photo. Since the stone needs to be turned, you either need to have a video of it, or have it in hand. A still photo doesn't capture the illusion. That is true. My aim was to show the tight banding that produces it. I have a nice one, not sure what type it is. I haven't posted a video before, but I'll try to take one and see if I can post it.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,681
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Post by Fossilman on Feb 17, 2021 16:57:46 GMT -5
Superb!!!
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illusionist
starting to spend too much on rocks
Member since August 2017
Posts: 137
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Post by illusionist on Feb 24, 2021 18:37:19 GMT -5
Amazing!
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Post by Starguy on Jan 20, 2022 13:09:23 GMT -5
Here’s a bot with decent parallax shadows.
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