Pendant Crystal

Can anyone tell me the real name of the of Jews Crystal?

I’ve got a necklace with a crystal pendant, I’ve been told that the common name is Jews Crystal. I can’t find any information on it though, can anyone tell me its correct name or any other information please.
It resembles Laprodite, irridescent, like petrol on water

my book says it could be spectolite
wiki says it has something to do with www 2

http://en.wikipedia.org/wiki/Spectrolite

http://www.bernardine.com/cabochons/spectrolite-cabs.htm

Or larvikite

http://www.cst.cmich.edu/users/dietr1rv/larvikite.htm

LABRADORITE

http://www.bestcrystals.com/labradorite.html

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