Igneous+Rock+Identification

Environment of Formation Intrusive-formed below the Earth's surface Extrusive- formed above the Earth's surface

Texture Vesicular- Has holes or bubbles. If a rock looks like Swiss cheese, it has a vesicular texture.

Composition Felsic- High silica content Mafic- Low silica content

Obsidian

[|Pumice]

Rhyolite

Granite

[|Pegmatite]

[|Andesite]

[|Basalt]

Peridotite

Diorite

Gabbro

Scoria