"Freeze-Dried Specimens"

Porphyritic igneous rock containing biotite, feldspar, and hornblende.

Pumice is light colored glassy rock that floats in water.

Dark gray, composed mostly of pyroxene and olivine.

Study the Formation of Different Igneous Rocks

Coarse grained and abundant in plagioclase feldspar.

Dark gray, with hornblende as the dominant mafic mineral.

Fine to medium-grained with biotite.

Gray-to-brown basaltic, with over 50% vesicles.

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

Classic, very coarse-grained igneous texture.