Igneous Rocks Examples. [citation needed] That usage, with the contrasting term "basic rock", was based on an incorrect idea, dating from the 19th century, that "silicic acid" was the chief form of silicon occurring in rocks. 4b in Nutman et al., 1984). Compare and contrast granite and rhyolite. Create an account to start this course today. Therefore, rocks are divided into ultramafic, mafic, intermediate, and felsic. There are examples known of highly sheared granites which can be mistaken for rhyolites. Obsidianis natural volcanic glass. The word igneous means that the rock became a solid after having originally been hot magma, or lava. 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What results when carbonic acid reacts with potassium feldspar? Due to the color of the minerals forming them, the rocks are either light or dark. credit by exam that is accepted by over 1,500 colleges and universities. Occurrence of igneous rocks can be either intrusive (plutonic) or extrusive (volcanic). Geologists don't intend to be confusing by using so many terms, but rather the terms are used for different properties. Intrusive Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet, surrounded by way of pre-present rock (called us of a rock); the magma cools slowly and, as a result, these rocks are coarse-grained. The explosive volcanic eruptions that produce rhyolite are also sources of obsidian. In some cases, felsic volcanic rocks may contain phenocrysts of mafic minerals, usually hornblende, pyroxene or a feldspar mineral, and may need to be named after their phenocryst mineral, such as 'hornblende-bearing felsite'. Composition of igneous rocks reflects the chemistry of the original magma. This may not sound very specific, and in fact there are many different kinds of feldspar. Feldspar is linked to German. Mafic minerals are typically dark in color (black, brown, or dark green) and rich in iron and magnesium. Because there are so many forms that all these minerals can take, there are also many types of granite. - Definition & Explanation, What is a Map Key/Legend? As a group, feldspars form about 60% of Earth's crust. When it cools and crystallizes into rock, the rock will be described as felsic igneous rock. Mafic: Derived from the words magnesium and ferric (Fe is the chemical symbol for iron) to describe an igneous rock having abundant dark-colored, magnesium- or iron-rich minerals such as biotite, pyroxene, or olivine. An example of a felsic rock is granite, the light colored rocks that we find in places like the Sierra Nevada mountains in California. High specific gravity 3. Typical felsic rocks are dacite and rhyolite. The similarity of the resulting term felsic to the German felsig, "rocky" (from Fels, "rock"), is purely[citation needed] accidental. Mafic rocks are made of _____ & _____ magnesium & Ferric. To learn more, visit our Earning Credit Page. - Definition, Examples & Facts, Geography of the Northeastern United States, Informational Listening: Definition & Skills, Quiz & Worksheet - The Boy Who Cried Wolf Plot. Igneous rocks with 0-15% dark colored minerals (or 0-15% MCI) are the felsic rocks (Figure 4A), igneous rocks with 46-85% MCI are the mafic rocks (Figure 4C), and igneous rocks with over 85% MCI are considered ultramafic (Figure 84D). For example, granite contains around 70% of silica. Igneous Rocks. intermediate _____ is an example of an intermediate rock. Older, broader usage is now considered archaic. Felsic rocks are richer in K, Na, Al and Si, and, compared to mafic rocks, are … a) A very large one that has a very broad gentle slope that looks like a warriors shield from a distance. While non-geologists may look at a rock and just see a rock, geologists are likely thinking of one of the hundreds of descriptive terms they use to describe rocks. All Felsic rocks contain a high percentage of silica. 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Unlike mafic rocks, which are rocks high in magnesium and iron (like basalt), felsic rocks come in amazing and unforgettable varieties. All other trademarks and copyrights are the property of their respective owners. Like more familiar kinds of glass, it's high in silica. These varieties include the aforementioned feldspar, which is the name for a group of aluminum silicate minerals containing the light metallic elements potassium, sodium, or calcium; quartz, which is a silicate mineral that comes in a vast array of different forms, from semiprecious gemstones to common sand; and granite, which is a felsic rock containing feldspar and quartz along with mica and amphibole, which are also silicate minerals.

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