Geol 1040 1st Edition Lecture 10Outline of Last Lecture XX. Mineral Physical propertiesa. Crystal shapeb. Colorc. Cleavaged. Lustere. Effervescencef. Hardnessg. Streakh. Magnetismi. Densityj. OtherXXI. Classification of mineralsa. Rock forming mineralsXXII. Periodic tablea. Classes of minerals based on particular elementsb. Nativec. Sulfidesd. Carbonatese. Oxidef. Haliteg. Sulfatesh. SilicatesOutline of Current Lecture XXIII. Igneous Rocksa. What is magmab. What causes magma to be pushed outc. Igneous rocks are formed when magma coolsXXIV. Characteristics of magmaa. Extrusiveb. Intrusive/ PlutonicXXV. Classification of igneous rocksThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.a. TexturesAmount of silicaXXVI. Types of Igneous texturesa. Aphaniticb. Phaneriticc. Porphyriticd. Pegmatice. GlassyCurrent LectureXXIII. Igneous Rocksa. What is magmai. Liquid silicate rich material1. If you melt a rock into a liquid the most common element Is silica2. Made up of at least 50% of silica and oxygenb. What causes magma to be pushed outi. Heated gasesc. Igneous rocks are formed when magma coolsXXIV. Characteristics of magmaa. Extrusivei. Magma that solidifies at the surfaceb. Intrusive/ Plutonici. Magma that solidifies beneath the surfaceXXV. Classification of igneous rocksa. Texturesi. crystal size1. Determined by rate of coolinga. Slow rate promotes the growth of fewer but larger crystalsi. Allows element molecules to migrateb. Fast rate forms many small crystalsc. Very fast rate forms glassii. Amount of dissolved gas1. Causes gas bubblesb. Amount of silicaXXVI. Types of Igneous texturesa. Aphanitici. Fine grainedii. Rapid cooling of magma: extrusiveiii. Microscopic crystalsiv. May contain vesicles (holes from gas bubbles)b. Phaneritici. Course-grained textureii. Slow cooling of magma- intrusiveiii. Crystals can be identified without a microscope: intrusivec. Porphyritici. Minerals form at different cooling ratesii. Large crystals are surrounded by smaller crystalsd. Pegmatici. Minerals > 1 cmii. Minerals form in “volatile” rich magmae. Glassyi. Very rapid coolingii.
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