"AP physics"

Our Most Popular collection.

Give your students a piece of outerspace.

Gray and poorly sorted, with a gritty texture.

Everything Students Need to Work Independently to Identify Rocks and Minerals

Lustrous, black 'hard coal'.

Coarse-grained, with microcline, biotite and horblende phenocrysts.

Glassy; most specimens float in water.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.