Description: This green stuff confuses me. If I saw it on any other rock I'd assume that it's some sort of tiny lichen. So here I presume the same. But it always seems to grow on the black stuff. So is the black stuff also lichen? But in other specimens you'll see, it really looks more like mineralization. Is the black just a lichen-friendly substrate? Is some black minieralization and other lichen? I really don't know how to interpret the green and black.

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