Gabbro is a plutonic igneous rock with the same mineral composition as basalt. However, as a plutonic rock it cooled much more slowly, resulting in a coarse grained texture.

The majority of the Earth's crust (the oceanic crust) consists of gabbro produced at mid-ocean ridges.

Gabbro is dense, greenish or dark gray.

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

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