I read (what I could understand) the moonstone post with great interest. I didn't want to high-jack that thread, so I'm posting a new topic.
I was given some interesting labradorite (whose RI is a little higher than it should be; more in line with the RI of andesine) which shows a pink/yellow sheen. Would this be caused by larger particles in suspension or thicker layers than what is displayed in the blue sheen moonstone?
Here's one that I faceted where you can see those colors reflected. The cabochon is impossible to photograph; the pink sheen is so faint I don't believe I can get a picture of it. The interesting thing is that this stone was cut with a far steeper than average pavilion, yet still reflects/reftracts very well.
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