Igneous rock

Gabbro

Mafic, intrusive and coarse-grained.

Equivalent: Basalt is its volcanic equivalent.

**Gabbro from Rum, Scotland, thin section.** Wikimedia Commons (author and license on the file page). Source

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More photos and thin sections

Alex Strekeisen: Gabbro (thin sections)

Other igneous rocks

Granite · Diorite · Peridotite and dunite · Rhyolite · Andesite · Basalt · Komatiite · Obsidian, pumice and scoria

Sources

Panchuk, Physical Geology 7.3: Classification of Igneous Rocks