1. A lump or mass of hard consolidated mineral matter. 2. Material consisting of the aggregate of minerals like those making up the earth's crust. 3. (figurative) someone who is strong and stable and dependable. 4. A genre of popular music originating in the 1950s.

This month's topic gave members an opportunity to explore the world of geology.

Rocks in photographs can range from prominent features in a landscape to one or more much smaller items with different colours, shapes and textures.

Members' photos of rocks are shown below.