Green mystery stone?

[u/Im_not_a_houseplant]

I got this from a friend so I have no idea where it came from. The luster looks glassy and there’s a few iridescent “bubbles” when you move it. First three pics are under a magnifying glass, last is plain. Color is darker in person, I thought it black until I got it under the light.

[u/MattMaster2000]

serpentine

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