Posted by: Beadman Post Reply
04/21/2024, 15:36:29
Hi Stef, Fossil coral normally results from petrification--which is (often or usually) the replacement of the coral constituents with quartz (agate). The soft tissues were probably replaced first, followed eventually by the calcite that forms the hard mineral parts of corals (of the stony groups). This is not "hardening"--but rather is transformation, to a material (that in fact) is harder. This transformation probably takes a very long time, and happened millions of years ago. Under certain circumstances, fossil coral can be red or reddish. This is not a result of maintaining its original color, but rather has to do with the chemical nature of the replacement mineral. (It would be difficult to know or say what the original color might have been.) What is the source of information that coral is "bleaching" due to pollutants? I have to suppose "bleaching" is a euphemism, rather than an actual action. It might be possible that normally red coral might tend to grow in a more-pale color, due to environmental distress. But "bleaching" suggests the color was red and faded. And that would be surprising. JDA.
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Posted by: Beadman Post Reply
04/21/2024, 15:42:06
This is a dialogue from 2007 that is about artificially coloring agatized fossil coral. It begins with two ancient fossil coral beads that are "naturally" reddish. JDA.
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Posted by: nishedha Post Reply
04/22/2024, 08:33:45
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Posted by: Beadman Post Reply
04/27/2024, 00:49:11
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Posted by: nishedha Post Reply
04/27/2024, 01:50:37
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Posted by: nishedha Post Reply
04/27/2024, 11:16:53
How silly of me, more probably Roman Era: Islamic beads don't favor human faces!
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Posted by: Beadman Post Reply
04/28/2024, 17:31:10
My smily is an edited photo of an actual geode slice, made famous a few years ago.
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Posted by: nishedha Post Reply
04/29/2024, 00:08:33
...reality is by far more breathtaking than fiction! (As an afterthought, fiction may be but a form of reality...and Reality, I have been told, just Illusion).
Modified by nishedha at Mon, Apr 29, 2024, 03:27:16
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Posted by: beadman Post Reply
04/29/2024, 15:56:27
Whether minerals, plants, people, or any lifeform.
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Posted by: nishedha Post Reply
04/30/2024, 00:54:25
...in "people" animal are included, aren't they?
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Posted by: Beadman Post Reply
05/02/2024, 19:14:59
(Plants too.)
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Posted by: nishedha Post Reply
05/04/2024, 01:09:17
...although some are nicer than others.
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Posted by: nishedha Post Reply
05/04/2024, 01:11:09
A gold (tumbaga?) pendant bead, from the precolumbian Tairona people.
Modified by nishedha at Sat, May 04, 2024, 01:13:01
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Posted by: stefany Post Reply
05/01/2024, 13:03:58
you can even print from a section of red cabbage-
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Posted by: nishedha Post Reply
05/01/2024, 23:58:32
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Posted by: nishedha Post Reply
04/27/2024, 11:17:08
Modified by nishedha at Sat, Apr 27, 2024, 11:18:08
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