"STEM kits"

Earthy, yellow brown iron ore.

Obsidian is hard black colored, volcanic glass.

Porphyritic igneous rock containing biotite, feldspar, and hornblende.

Pumice is light colored glassy rock that floats in water.

Conglomerate is a sedimentary rock made up rounded quartz pebbles.

White to gray, medium to coarse-grained, crystalline.

Sale

Gray to white metamorphosed carbonate rock.

Muscovite is a mica mineral cut to demonstrate basal cleavage.

Kaolin is a white clay mineral that has vast industrial uses

Sale

Hemalite is a Massive, dense red to gray, classic example of iron ore.