Gabbro (#11) main content.

Gabbro (#11)

Part of Hall of Minerals.

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This specimen is an example of a rock that formed in a magmatic environment. 

Magmatic: Gabbroic Minerals
Magma is a complex solution composed chiefly of silicate minerals and dissolved gases such as water vapor and carbon dioxide.

They type of magma rich in magnesium and iron is called a mafic magma. As the magma slowly cools, crystallization takes place; which minerals develop depends on the temperature reached. At 1200°C, the first stage of crystallization, minerals such as olivine, feldspar, pyroxene, and spinel typically develop and make up a common kind of igneous rock called gabbro.

Mafic magmas, formed in Earth’s u