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nomadiclifeguide
Do fossils fade if exposed to sunlight displayed on a windowsill? 
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Rhaetianpenarth207
I don’t think so but pyrite fossils are damaged when exposed to air.
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nomadiclifeguide
I have had a pyrite Eodeocerous from black ven on the side for 15 years, does the stability of a specimen depend on the bed that it's from?
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Gary W
Amber should be kept out of sunlight idealy in the dark as exposure can craze the surface.
Gary
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Elbert
Hello, your Eoderoceras, wich is now Eteoderoceras, will be alright, but the Echioceras are best kept cool, dry and dark and even then they tend to get pyritedisease, even when they have not been in the sea...

greets, Bert
the search is as valuable as the finds...
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nomadiclifeguide
What is the cause of pyrite disease? Paddy Howe once told me he had tried sealing Echioceras inside resin blocks but they still deteriorated and split the resin.
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Elbert
Hello, Pyrite and her sister mineral Marcasite are basicly made up from iron and sulphur (FeS2) and this is an unstable aliance; given circumstances with changing  temperatures and moist air it can react on itself, degrade and produce melanterite (a poisoness mineral) and sulphuric acid.
There may also be some bacteria involved, the ones that love chemicals...
Some pyrites and Marcasites are quit stable, other very unstable; pyritized fossil wood is often extremely unstable.
What precise makes it stable or not, I do not know.
Always be carefull to put pyrite fossils in your cabinet; when it "blooms"= degrades, the sulfuric acid will damage the other fossils and your cabinet.
A shame that some of the most beautifull fossils, like the Echioceras, are so vulnerable.

greets, Bert
the search is as valuable as the finds...
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nomadiclifeguide
That's great info Bert thank you. I had heard different things from different people as to why some degrade and others do not.
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