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Originally Posted by Sylmar
When light hits it directly it appears to be black but when I backlight it it is either green or blue, depending on the direction.
I also have a opaque cabochon in the mail. The opaque one it also beautiful!
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I've only seen the type you have online.
The opaque ones are also very dark, appearing to be black depending on the light. But they are a beautiful blue when you shine a bright light on them, some with green in it as well.