PPT-Lecture 3: Igneous Textures & Rock Geometry

By David Allison Igneous Texture Texture size shape and arrangement of constituent mineral grains Crystallinity percentage of crystals versus glass depends on Rate of cooling SiO2 content of magma. Colby Geology. Igneous Rocks. Classification based on . composition. and . texture. .. COMPOSITION. Principally the rock-forming minerals. Olivine. Pyroxenes. Amphiboles. Micas. Feldspars. Quartz. Constitute 95% of minerals in . “Liquid Hot Magma!”. Igneous Rocks. Rocks formed from cooling of lava or magma. Lava-Melted rock erupted from volcanoes and deposited on the earth’s surface. Cools quickly.. Magma-Melted rock that sits inside the earth in a magma chamber. Cools slowly.. By Mr. Krall. What is a Rock?. A . rock. is a mixture of minerals.. Rocks form and reform through the . rock cycle. . . Lava/Magma. THE ROCK CYCLE. Igneous Rock. Igneous . (. ig. -nee-us) . rock. forms when molten rock cools and solidifies.. Question #. 1b. Hardness. Texture Luster. Igneous rocks are classified in what three ways?. Question #1. Igneous rock that forms . IN. . the . earth is ________.. Igneous rock that forms when molten. Essential Questions:. Rock Cycle . A. . model that describes the formation, breakdown, and reformation of a . rock. .. Rock Cycle. Magma. Sediments. Igneous. Rock. Metamorphic. Rock. Sedimentary. Rock. 3 Types of Rocks. There are 3 different types of rocks;. Igneous. Sedimentary. Metamorphic. Igneous Rock . . Igneous rocks are formed by magma and lava as it cools. Igneous rocks form in two different ways. . 2. Major Rock Groups. Igneous. Formed from . molten rock (magma/lava) that has cooled. Literally means “from fire”. 1. Extrusive . igneous rock is formed from lava (on earth’s surface) and tends to solidify quickly. SC.7.e.6.4 explain and give examples of how physical evidence supports scientific theories that Earth has evolved over geological time due to natural processes.. Bellringer. 1. . A stream carves a channel through soil rock by removing a few small particles of rock at a time. The stream water slows down when it enters a pond, allowing the rock particles to settle at the bottom of the pond. Pressure combines these particles into a solid rock. What is the new rock called?. Metamorphic. Rock. What is it made up of?. Sand, clay, silt, organic matter (fossils). How is it formed (process)?. Weathering. (wind, flowing water, ice, living organisms) create sediment. Erosion. http://www.youtube.com/watch?v=aCnAF1Opt8M. 1. What are the building blocks of rocks? . 2. How are rocks classified?. 3. What are the parts of a volcano?. Magma chamber. vent. Crater. sill. Magma conduit. As magma cools underground, it will begin to solidify within Earth’s crust.. Once completely crystallized, these masses of igneous intrusive rock are referred to as INTRUSIONS or as PLUTONS. We will talk about several types of igneous . CLASSIFICATION OF ROCKS:. ON THE BASIS OF MODE OF FORMATION ROCKS ARE CLASSIFIED INTO THREE CATEGORIES:. 1 IGNEOUS ROCKS. 2 SEDIMENTARY ROCKS. 3 METAMORPHIC ROCKS.  . ROCKS. IGNEOUS ROCKS:.  . IGNEOUS ROCKS, ALSO KNOWN AS PRIMARY ROCKS ARE FORMED BY SOLIDIFICATION OF MAGMA. MAGMA IS MOLTEN ROCK MATERIAL CONSISTING OF LIQUID,GAS AND CRYSTAL.IGNEOUS ROCKS ARE RECODS OF THERMAL HISTORY OF EARTH.. . GLY 4310 - Spring, 2020. 2. Igneous Textures. Phaneritic:. Crystals are readily visible with the unaided eye.. Aphanitic:. Crystals, if present, are too small to be seen with the unaided eye.. Fragmental: . The Rock Cycle. Defined: . The process by which all rocks on Earth are formed and how basic Earth materials are recycled over time . Note: A very, very long time. The Rock Cycle. Three main types of rock on Earth.