Basalt

[Sarah]

A rock of igneous origin, consisting of augite and triclinicfeldspar, with grains of magnetic or titanic iron, and also bottle-green particles of olivine frequently disseminated.

[Sarah]

1. A hard, black, often glassy, volcanic rock. It was produced by the partial melting of the Earth's mantle.

2. A stone-like, hard black unglazed pottery.

[Sarah]

joke form of the word assult for the geologically inclined

[Sarah]

A type of igneous rock usually associated with table making.

[Justin Bieber]

1. [hard] [black rock]
2. [Nelson]

[Kit]

A dark fine-grained volcanic rock that sometimes displays a columnar structure, typically composed largely of plagioclase with pyroxene and olivine.