"Ward's Phenomena"

Coarse-grained plagioclase and pyroxene with some olivine.

Gray andesite with phenocrysts of felspar and/or hornblende.

Dark gray, with hornblende as the dominant mafic mineral.

Fine to medium-grained with biotite.

Medium-grained with biotite.

Light gray, with flow structure.

Dark gray, composed mostly of pyroxene and olivine.

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

Samples of Intrusive and Extrusive Igneous Rocks

Porphyritic igneous rock containing biotite, feldspar, and hornblende.