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Homework-1 on Igneous Rocks

Homework-1 on Igneous Rocks - formulas 3 What minerals are...

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Name ……………..………… ……….……………… (Last) (First) Homework-1: Igneous Rocks (2 pts each for a total of 10 pts) 1. What is the main factor that affects the size of minerals in igneous rocks? The rate at which the lava or magma cooled to form a rock and the availability of the chemicals required to form the crystals 2. Define the following terms as they relate to igneous rocks: a. felsic: light-colored, felsic refers to feldspars (fel) and other silica-rich (sic) minerals b. mafic: dark colored, mafic refers to the magnesium (ma) and iron (fic) in their chemical
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Unformatted text preview: formulas 3. What minerals are commonly associated with mafic rocks like gabbro? Biotite mica, amphibole, pyroxene, and olivine 4. What minerals are commonly associated with felsic rocks like granite? Quartz, plagioclase feldspar, potassium feldspar, and muscovite mica 5. According to Bowen’s Reaction Series, which of the following minerals will crystallize first? a. Olivine b. Quartz c. Potassium Feldspar d. Fluorite e. Spangaldyite...
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