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Phyllite Sand


JackG

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it means that it is generated from the igneous rock upward. so on provinces border of, say, granite and andesite, it could be under igneous rock. bottom up layers: andesite->phyllite->granite->other metamorphs and sedimentary rocks.

the rest of metamorphs and of course sedimentaries are generated top down, and thus always are on top of igneous rocks.

skipping basalt as it behaves totally different.

 

So in order to find phyllite sand you need: only one igneous rock, preferably in the middle of igneous province, phyllite as the only metamorph, and no sedimentary on top. Quite a rare combination.

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