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I got this rainbow moonstone from Jaipur, India. The front and back are polished, has black tourmaline around it’s edges, and is 25x28mm. I didn’t notice it when I bought it but It seems to have another harder mineral growing inside and around the stone. Maybe Aquamarine? It’s long like Aquamarine with a blue green color. Does anyone know what it could be?

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  • $\begingroup$ Not very good with minerals but it appears to me that the inside is primarily a type of feldspar, similar to Labradorite or Sunstones. See en.wikipedia.org/wiki/Labradorite and en.wikipedia.org/wiki/Sunstone. $\endgroup$ – Friddy Aug 24 '18 at 17:08
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    $\begingroup$ I am not entirely clear what you are looking for, is it pale green inclusions, those could be Olivine or Pyroxene. $\endgroup$ – Friddy Aug 24 '18 at 17:21
  • $\begingroup$ The inside is Rainbow Moonstone which is a type of Labradorite. It’s the pale green inclusions I’m trying to identify. $\endgroup$ – TeachMe Aug 24 '18 at 17:37
  • $\begingroup$ Some of the inclusions are hexagonal in shape. Thanks for the help. $\endgroup$ – TeachMe Aug 24 '18 at 17:40
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Hexagonal in cross section, elongated in the perpendicular section, dull green.

I am guessing this is either apatite or beryl. One way to test would be a hardness test. Apatite is softer than quartz, and beryl is harder than quartz. Take a piece of quartz and try to scratch the mineral. Clear the mark. It the scratch remains, it's apatite. If it does not remain, it's beryl.

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  • $\begingroup$ I’ve done the test and the scratch does not remain. Maybe my first guess of it being Aquamarine was right. Thanks for the assist Gimelist! $\endgroup$ – TeachMe Aug 25 '18 at 10:12

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