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Preparing a list of light sensitive minerals - (14)
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ellencmoe




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PostPosted: Jun 03, 2012 13:35    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

This is a great topic.

My experience is very limited - mostly with pegmatite specimens from San Diego County, California, US.

Beryls can develop color when exposed to sun. I left a bucket of chunks of what I assumed were quartz in my yard. A few months later, one piece on top had developed a very nice aquamarine color. Unfortunately, a nice crystal from the 49-er pocket which is pale aquamarine on one corner, mostly colorless in the center, and pale peach morganite on the far corner, did not develop better color even when left in the sun all summer.

Spodumenes are also affected by sunlight, although I am not sure they always lose color. Kunzite has the nickname "The Evening Stone" since it may fade if exposed to sunlight/UV light. The pieces of spodumene I find on the old tailings from the Pala Chief Mine tends to be totally lacking color. But, the owner of the Oceanview Mine, also on Chief Mountain in Pala, California has experimented with some pieces of spodumeme he has been finding in abundance the last few years. A few of the beautiful purple Kunzites he left in the sun did not lose color. He also tried putting sunblock (sun tan lotion on pieces). The Oceanview Mine website www(dot)digforgems(dot)com may still have the results of his tests.

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Carles Millan
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PostPosted: Jun 03, 2012 13:50    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

Snowman wrote:
I came across some copper sulfate minerals(Cant find the name) that were sitting in the shade. After about a few days i decided to collect some and once they were in the sunlight their colour faded within an hour.

Hi !

For the hydrated copper (II) sulphate to keep its typical blue color it has to retain all the five water molecules. If it loses some of the water, the color fades, and will eventually become white when anhydrous. Exposing it to the sun is an easy way to have it partially dehydrated.
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Maxilos




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PostPosted: Jun 03, 2012 14:46    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

I think this is a great topic for starters, and especially if they don't know everything about their specimens.

Mark

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Riccardo Modanesi




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PostPosted: Jun 04, 2012 08:41    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

Hi!
From the photos of the (at present) two amethyst specimen I can't appreciate so big a difference in color! Maybe by seeing these specimen truly and not through a picture, the difference would be clearer.
Greetings from Italy by Riccardo.

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Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
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Olivier




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PostPosted: Oct 23, 2020 09:22    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

Out of curiosity, did this list ever see the light of day? (pun intended)
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