Examples of igneous rocks include granite, pegmatite, diorite, gabbro, dunite and peridotite. Other examples of igneous rocks are kimberlite, rhyolite, quartz porphyry, dacite, latite, andesite, basalt, obsidian and pumice.Continue Reading
Granite is a hard, intrusive igneous rock that has been valued for centuries for its beauty and durability as a building material. The color of granite can be white, gray, pink, yellow or green. As a felsic rock, it's made largely of quartz and feldspar and may have accessory minerals of pyrite, zircon and tourmaline and accidental minerals of garnet and muscovite mica. Accessories are components that are usually found in small amounts in a rock but aren't necessary to its definition. Accidentals are not usually found in the rock.
Dunite is an ultramafic igneous rock. This means that it is especially abundant in magnesium and iron. It's mostly made out of olivine and takes its name from Mount Dun, New Zealand, where it's abundant. It's an ore of chromium.
Obsidian and pumice are both extrusive igneous rocks, which means they're the result of a volcanic eruption. Both are usually felsic, but obsidian is famous for being shiny black with a glassy texture. Pumice is light gray to red and has a porous texture.Learn more about Geology