"STEM kits"

Obsidian is hard black colored, volcanic glass.

Porphyritic igneous rock containing biotite, feldspar, and hornblende.

Pegmatite is igneous rock similar to granite but with larger crystals.

Sale

Pumice is light colored glassy rock that floats in water.

Conglomerate is a sedimentary rock made up rounded quartz pebbles.

Breccia is a sedimentary rock made up of angular rock fragments.

Gray to white metamorphosed carbonate rock.

Muscovite is a mica mineral cut to demonstrate basal cleavage.

Pink Gneiss is foliated pink and black bands of biotite.

Sale

Chert is a microcrystalline, hard, silica mineral.