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Is rainbow moonstone part of the moonstone family? & can their be a cats eye moonstone?

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asked Dec 26, 2015 by Mary Simpson (120 points)

2 Answers

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Rainbow moonstone is better known as labradorite. Moonstone and labradorite are similar in that they are part of the feldspar family. And yes, I have seen cat's eye moonstone, so it does exist.
answered Dec 28, 2015 by hershel (49,750 points)
Hi Hershel, Thank you for answering my question. Much appreciated. Mary
0 votes

Yes, they can be referred to as rainbow moonstone, however they are not a separate mineral. It is a sodium, potassium, aluminum silicate(Na,K) AlSi3O8.. It is formed from two species of feldspar, orthoclase and albite. These form flat layers though which light is diffused producing a shimmer resulting in the phenomenon of adularescence (a blueish luster or glow originating below the surface of a gem, for example, a moonstone)That is what the pearly opulescence is officially called. 

answered Dec 28, 2015 by Weasel (52,070 points)
Hi Weasel, Thank you for your comment. Much appreciated. Mary
I googled cats eye and it is just as Herschel says. The official definition is a polished gemstone including beryls, moonstones and others. Not an official mineral as such but a descriptive term form the appearance of different minerals.