Chapter 4 Igenous Rocks Lab Workbook

PRE-LAB QUESTIONS 1. Which of the following are mafic minerals? (Select all that apply) a. Quartz b. Pyroxene c. Plagioclase d. Olivine 2. Rocks that cool quickly have ___ crystals. Small 3. Rocks that cool slowly have ___ crystals. Large 4. True or False? Rocks formed from volcanic eruptions are an example of extrusive igneous rocks. True 5. What textures are possible in intrusive rocks? (List all that apply.) Coarse-grained, phaneritic 6. What textures are possible in extrusive rocks? (List all that apply.) Fine-grained, aphanitic ©2016, eScience Labs Igneous Rocks Igneous Rocks Igneous Rocks

EXERCISE 1 DATA SHEET Table 3. Salol Crystallization Environment Observations Dry Styrofoam® Cup The salol melted in the hot water with round crystals Styrofoam® Cup with an Ice Cube The salol turned into crystals that looks like crushed ice ©2016, eScience Labs Igneous Rocks Igneous Rocks Igneous Rocks

EXERCISE 2 DATA SHEET Table 5. Igneous Rock Identification Sample Letter Color Mafic Color Index Minerals Present Texture Rock Name A Dark grey- black 45-85% Feldspar, plagioclase, amphibole, pyroxene, olivine Aphanitic Basalt B Light-colored 0-15% Quartz, Muscovite, feldspar, plagioclase, biotite, amphibole Aphanitic Rhyolite C Grey 0-15% Quartz, Muscovite, plagioclase, feldspar, biotite, amphibole Phaneritic Granite D Dark red 45-85% Feldspar, plagioclase, amphibole, pyroxene, olivine Vesicular and aphanitic Scoria E Black 0-85% Dark quartz Glassy Obsidian F Dark colored 45-85% Plagioclase, amphibole, pyroxene, olivine Phaneritic Gabbro ©2016, eScience Labs Igneous Rocks Igneous Rocks Igneous Rocks

EXERCISE 2 POST-LAB QUESTIONS Check all the boxes that apply to each of the samples: Table 6. Sample Textures and Compositions Sample Letter Intrusive Extrusive Mafic Felsic Intermediate A X X B X X C X X D X X E X X X X F X X ©2016, eScience Labs Igneous Rocks Igneous Rocks Igneous Rocks