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Rock Identification
Performance Task
| Description | Rock or Characteristic |
|---|---|
| Glassy,Black | Obsidian, Extrusive Igneous |
| Coarse-grained, Visible Grains of Quartz, Feldspar, Mica | Granite, Intrusive Igneous |
| Very Fine-grained (Tiny, Sparkly Crystals), Dark Gray, Some Samples have Vesicles | Basalt, Extrusive Igneous |
| Very Light Heft (Low Density), Vesicles | Pumice, Extrusive Igneous |
| Nonfoliated, White, Reacts to Acids (Vinegar) | Marble, Metamorphic |
| Nonfoliated, Creamy Colored, Formed from the Mineral Quartz, Does NOT React to Acids (Vinegar) | Quartzite, Metamorphic |
| Foliated Bands of Dark and Light Colored Minerals | Gneiss, Metamorphic |
| Foliated Bands, Contains Muscovite Mica | Muscovite Schist, Metamorphic |
| This term refers to minerals being stretched in a metamorphic rock from heat and pressure in Earth's crust. | Foliation |
| This term refers to minerals being randomly placed in a metamorphic rock. | Nonfoliated |
| This term refers to minerals observed in metamorphic rocks that allow geologists to determine how deep the rock formed. | Index Minerals |
| This term refers to holes in an igneous rock that form from gases being released as the rock cools. | Vesicles |
| This term refers to an igneous rock that is darker in color and denser (due to its mineral composition). | Mafic |
| This term refers to an igneous rock that is lighter in color and less dense (due to its mineral composition). | Felsic |
| This term refers to an igneous rock that forms on Earth's surface. | Extrusive Igneous Rock |
| This term refers to an igneous rock that forms under Earth's surface. | Intrusive Igneous Rock |
| This term refers to a rock's texture that has minerals that are large enough and easy to see. | Coarse-grained Texture |
| This term refers to a rock's texture that has minerals that are tiny and may be difficult to see. | Fine-grained Texture |
| This term refers to the processes compaction and cementation working together to form a sedimentary rock. | Lithification |
| This term refers to the layers in a sedimentary rock. | Strata, stratification |
| This term refers to the 'gluing' of sediment by minerals. | Cementation |
| The terms refers to the process of sediment squeezing together after being deposited. | Compaction |
| This term refers to a sedimentary rock that is formed from sediment or fragments of rock that is glued together by minerals. | Clastic |
| This term refers to a sedimentary rock that is formed from organic matter. (You may see fossil imprints) | Organic |
| This term refers to a sedimentary rock that is formed from minerals in a solution left behind after water evaporates. | Chemical |
| Dark, Earthy, feels light when hefted. | Coal, Organic Sedimentary |
| Obvious Strata, formed from sand. | Sandstone, Clastic Sedimentary |
| Grey, Reacts to Acids (Vinegar) | Limestone, Chemical Sedimentary |
| Light Cream in Color, Obvious Rock Fragments | Conglomerate, Clastic Sedimentary |
| Oceanic Crust | Denser, Basalt |
| Continental Crust | Less Dense, Granite |
Created by:
wba10885
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