Slate is a low grade metamorphic rock with a fine grain. Slate often has a gray color and may be split into parallel layers. The precursor rock is generally a shale or siltstone.

Slate is used as roofing, as the flat beds of billiard tables, and historically had many other uses since replaced (such as school blackboards).

See Steve's video interview about asteroid capture at Moonandback:
Part 1
Part 2
Part 3

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