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No. Microcrystalline silicas are extrusive/volcanic and rarely have gold. It could happen but it is rare.

But anything is possible. If it was tuly "tested" for gold that would mean that is was assayed? That involves crushing, splitting and refining. An gc/ms analysis is non destructive but would only tell you what the very surface is composed of. If that rock has gold in it you can inspect it with a 30X loupe and see it. Otherwise crush the thing and pan it and see.

One thing is for certain the rock is not big or rich enough to be very valuable, even if it was 50% gold. So beat it to dust and pan the stuff. If there is gold you will see it.

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