"AP physics"

Gray and poorly sorted, with a gritty texture.

Specimens To Supplement the Most Widely-Used College Lab Manual for Physical Geology

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

Gray to white, coarse crystalline, carbonate rock.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Glassy; most specimens float in water.

Fightly cemented, medium-to-coarse quartz grains.

Grayish black trap rock.

Lustrous, black 'hard coal'.

Everything Students Need to Work Independently to Identify Rocks and Minerals

Teacher’s Master Set for Use with Student GEO-logic® Physical Geology Sets