"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.

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Pumice is light colored glassy rock that floats in water.

Gabbro is Mafic igneous rock formed deep underground consisting of olivine and pyroxene.

Anorthosite is an intrusive, igneous rock consisting of predominantly plagioclase feldspar.

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Introduce your students to rocks formed from the cooling of magma and lava.