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Minerals with alexandrite effect?
  
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Alalit




Joined: 19 Mar 2016
Posts: 6

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PostPosted: Jan 13, 2019 03:50    Post subject: Minerals with alexandrite effect?  

Hello again! It's been a long time since I last posted here, but I do my best to regularly check what others wrote.

I think the beginner's section will be the the best place to ask my question.
Do you know any naturally occurring minerals or synthetic gems that display the alexandrite effect? Besides, obviously, alexandrite and "zultanite" (Turkish diaspore).
Are some compounds / crystal systems more favorable to produce this effect? Could this be obtained, for example, with Al2O3 matrix using specific dopant(s)?

I will be grateful for some guidance, where to search for this piece of knowledge.
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Riccardo Modanesi




Joined: 07 Nov 2011
Posts: 522
Location: Milano

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PostPosted: Jan 13, 2019 10:58    Post subject: Re: Minerals with alexandrite effect?  

Hi Alalit!
There is a colour-changing spessartine garnet as well! It is yellowish under natural sunlight and pinkish under artificial light.
Some diamonds which are fluorescent to UV display a colour-changing as well.
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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