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I found it on Vancouver Island, B.C, Canada. It is reflective like a safety vest and has crystals.

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closed as off-topic by user12525, trond hansen, Fred, BillDOe, arkaia Sep 1 at 23:05

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    $\begingroup$ Any more info based on this guide? $\endgroup$ – Jan Doggen May 23 '18 at 7:09
  • $\begingroup$ Would it be possible to get a higher-resolution photo or a closer image to see the details of the crystal shapes? $\endgroup$ – haresfur May 24 '18 at 2:32
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You have a metamorphic rock which may contain: actinolite?, chlorite? and pyroxene. Thes rock shows evidence of being a a high-grade greenschist to amphibolite metamorphic rock. Type of metamorphic rock (classified by the minerals present) can indicate of the pressure and temperature conditions under which the rock was formed.

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A geologic map indicator of Vancouver Island showing rock types. Metamorphism is common along thrust belts.

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Given the preponderance of young volcanic rocks in your part of the world I'd be inclined to go with Ignimbrite as my first guess. The picture you have supplied looks almost identical to samples I have at home of welded ignimbrites from the Taupo Volcanic Zone. The black inclusions are likely to be Pyroxene phenocryst in a groundmass of what was at one point white hot volcanic ash.

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