What is this thing?

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rock found on beach in the uk SOLVED (self.whatisthisthing)

submitted 2 years ago* (last edited 2 years ago) by Cruse2382 to c/whatisthisthing

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Son found this on the beach and is adamant its something special.

About the size of a lump of coal with glass like speckals.

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[–] Miarolitic 8 points 2 years ago

Yip definitely gabbro.

OP, the light/ white mineral is plagioclase the dark almost black mineral is pyroxene.

If you look at it in sunlight anything with a dark green colour is probably Olivine