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6: Igneous Rocks and Silicate Minerals

  • Page ID
    17515
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    7.79.png
    Figure 6.1: Xenoliths in basalt from San Carlos, Arizona. The brown xenolith contains olive-green olivine and brown orthopyroxene. The green xenolith contains light green olivine, (minor) emerald-green clinopyroxene, and darker orthopyroxene.

    KEY CONCEPTS

    • Igneous minerals crystallize from a magma to form igneous rocks.
    • Magmas have variable compositions giving rise to many different kinds of rocks containing different minerals.
    • Cooling rate affects crystal size and rock texture.
    • Minerals crystallize in an orderly and predicable way during magma cooling.
    • Silicates are the most important minerals in igneous rocks.
    • We classify silicates based on the arrangement and ordering of SiO4 tetrahedra within them.
    • Different silicate minerals have distinctive properties, atomic arrangements, and origins.


    This page titled 6: Igneous Rocks and Silicate Minerals is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Dexter Perkins via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.