Q:

What are some examples of ferromagnesian minerals in mafic rock?

A:

Quick Answer

Some examples of ferromagnesian minerals in mafic rock include olivine, pyroxene and amphibole. Rocks containing pyroxene and amphibole often also contain feldspar, a non-ferromagnesian mineral.

Know More

Full Answer

Olivine is made of fayalite, with a chemical formula of Fe2SiO4, and forsterite, with a chemical formula of Mg2SiO4. Pyroxene can be composed of enstatite (MgSiO3) and ferrosilite (FeSiO3). Igneous amphibole is made of hornblende, which is composed of an iron-magnesium silicate, a calcium-iron-magnesium silicate and an aluminum-iron-magnesium silicate. All of these minerals contain iron and magnesium. Mafic rock is a dark-colored category of igneous rock, the type of rock that forms from solidified magma.

Learn more about Geology

Related Questions

  • Q:

    How are minerals formed?

    A:

    Minerals are formed under a variety of conditions, including when molten materials cool, when liquids evaporate or cool and under high temperatures and pressures. Minerals are found in the earth's crust and mantle, and many were created when feldspar and quartz reacted with other materials during the formation of the planet.

    Full Answer >
    Filed Under:
  • Q:

    How are minerals classified?

    A:

    Minerals are most commonly classified by the Dana system. Minerals are identified according to hardness, specific gravity, color, luster, streak, cleavage and crystal form.

    Full Answer >
    Filed Under:
  • Q:

    What minerals are in marble?

    A:

    The mineral content of marble is primarily calcite, as well as smaller quantities of quartz, mica and pyrite. Trace minerals of clay or iron oxides in the marble may affect the color of the rock.

    Full Answer >
    Filed Under:
  • Q:

    What kind of minerals are most expensive?

    A:

    Painite, ruby, diamond, gold, lithium, black opal, blue garnet and jadeite are the most expensive minerals. Painite is one of the rarest minerals on the world, as only 25 crystals have been discovered. As of 2015, it sells for $60,000 per carat.

    Full Answer >
    Filed Under:

Explore