Wacke vs. Arenite — What's the Difference?

(geology) A soft, earthy, dark-coloured rock or clay derived from the alteration of basalt.

Arenite (Latin: arena, "sand") is a sedimentary clastic rock with sand grain size between 0.0625 mm (0.00246 in) and 2 mm (0.08 in) and contain less than 15% matrix. The related adjective is arenaceous.

A soft, earthy, dark-colored rock or clay derived from the alteration of basalt.

Any sedimentary rock with a grain size in the sand range on the Wentworth scale.