Lab 4 Igneous Rocks

Igneous Rocks PRE-LAB QUESTIONS 1. Which of the following are mafic minerals? (Select all that apply) BD a. Quartz b. Pyroxene c. Plagioclase d. Olivine 2. Rocks that cool quickly have small crystals. 3. Rocks that cool slowly have large crystals. 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.) Textures that are possibly in intrusive rocks are either pegmatite, phaneritic, or phenocrytal. 6. What textures are possible in extrusive rocks? (List all that apply.) Textures that are possible in extrusive rocks are either aphantic, pyroclastic, glassy, or vesicular. ©2016, eScience Labs

Igneous Rocks EXERCISE 1 DATA SHEET Table 3. Salol Crystallization Environment Observations Dry Styrofoam ® Cup For the Dry Styrofoam cup, I observed that it took a longer time to form a crystallization. In addition to this, it looks like the bottom of the cup is destroyed like it soaked up the Salol. That is what I observed from the Dry Styrofoam cup. Styrofoam ® Cup with an Ice Cube For the Styrofoam cup with an ice cube in it, I observed that the crystallization stated to happen right away. Furthermore, it also started to make like a sizzling sound when it was happening. The salon also formed a medium size crystal on the top of the ice cube. That is what I observed from the styrofoam cup with an ice cube. ©2016, eScience Labs

Igneous Rocks EXERCISE 2 DATA SHEET Table 5. Igneous Rock Identification Sampl e Letter Color Mafic Color Index Minerals Present Texture Rock Name A Dark, Black, Grayish Mafic Pyroxene Aphanitic Basalt B Light, Grey Felsic Biotite, Plagioclase, Glass Aphanitic Rhyolite C Light Felsic Quartz, Plagioclase, Biotite Phaneritic Granite D Dark Red, Maroon, Brown Intermediate Amphibole, Pyroxene Vesicular Porphyry E Brown, Black Mafic Pyroxene, Plagioclase Glassy Obsidian F Dark Green Mafic Pyroxene, Potassium Feldspar Phaneritic Olivine ©2016, eScience Labs

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 F X X ©2016, eScience Labs