not metal

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Thanks, but it's definately not metal. Here's some
more clues tho, unweathered it is red. Weathered
it is dark grey/black. It is a square shape, about
12" by 12", but it is hung with a single nail at one
corner, giving it a diamond pattern on the roof.

They can crack. When they do, it somewhat resembles
a grain line, but isn't perfectly in a straight line.
In the cracks, you can see what appears to be layers.

There are only a couple of other houses in town with
the same type of roofing. It is probably original
to the house (80-90 years old), but that can't be
confirmed. The round top caps are made of the same
material. Thickness is around 1/4", but I haven't
measured.

Can anyone confirm that this is indeed slate (or what
it might be if not -- asbestos?) Any clues on
new pieces to match? Salvage spots for older ones?

Thanks!!