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What are the different types of magma made of?

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Rhyolitic magma -- SiO2 65-75%, low in Fe, Mg, Ca, high in K, Na. Gases in Magmas. At depth in the Earth nearly all magmas contain gas dissolved .... The Mantle is made of garnet peridotite (a rock made up of olivine, pyroxene, and garnet) -- evidence comes from pieces brought up by erupting volcanoes. read more

Three types of magma exist on Earth today, and an extinct fourth type is unable to form on our cooled planet. Each magma type has a different chemical make-up, though the types are all mostly made up of silica and other minerals. read more

All magmas are composed almost entirely of molten silicate minerals, and the different types of magma stem from the different minerals in each type. Magma like you might see in Hawaii is very mafic - it contains more iron and magnesium and as a consequence is denser. read more

Since volcanic eruptions are caused by magma (a mixture of liquid rock, crystals, and dissolved gas) expelled onto the Earth's surface, we must first discuss the characteristics of magma and how magmas form in the Earth. Characteristics of Magma. Types of Magma Types of magma are determined by chemical composition of the magma. read more

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