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I found this rock and I want to know what it is. It looks like green-grey and when I put one side of the rock on the sun, it changes its colors on that side. Thanksenter image description here

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  • $\begingroup$ The location of where rocks were found may help those who could answer such questions. $\endgroup$ – Fred Nov 7 '18 at 2:11
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That’s labradorite, it’s a silicate and a type of plagioclase feldspar named after Labrador, Canada. The iridescent colours that are seen is called the “schiller” effect. It is caused by light being scattered by thin layers of feldspar within the rock that formed as it cooled.

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