Lab 2 Geo

Lab 2 Worksheet Minerals and Rocks (50 points, 50 possible answers) Name __Della_Fournet_ (-2 points if missing) Date _January 1 2024_____ PDFs AND HANDWRITTEN SCANS WILL NOT BE GRADED. ANSWERS MUST BE TYPED IN. ONLY THINGS YOU NEED TO TAKE AN IMAGE OF MUST BE HANDWRITTEN The powerpoints are your lab book. Use them, and the Mineral and Rock Identification attachments, to answer all questions in each part. Please explain everything in your own phrases and sentences. The worksheet is NOT the quiz! Use the powerpoint as you work to find your answers, or how to determine answers. This is the learning stage of the class. Humans learn by repetition, so by going over everything several times by hunting down answers, you will gain more than you think you will! Part 1 Minerals ( Use mineral box, Mineral powerpoint, and Mineral Identification Guide in the Lab powerpoint area of class ) Description of your personal sample : Include color, luster, hardness, cleavage or fracture, and special or distinguishing characteristic if any. Use the mineral and rock identification handouts in the content area. Non-observable info will take points off. Miner al Numb er Luster Color Hardne ss Streak Cleava ge or Fractur e Other if applicable Mineral Name 1 Vitreous Purple 4 White Cleava ge Fluorescent Fluorite 2 Vitreous Pink 6 White Cleava ge Cleavage angle < 90 degrees Feldspa r Microlin e 3 Dull/ metallic Black 5.5-6.5 Dark red Fractur e Magnetic when heated Hematit e 4 Metallic Light deep 6-6.5 Brown Cleava Brittle Pyrite

yellow ge 5 Vitreous White 7 None Fractur e Conchoidal fracture Quartz 6 Vitreous White 3 White Cleava ge Often fluorescent Calcite 7 Vitreous/ pearly Colorle ss 2-2.5 Colorle ss Cleava ge Thin Mica- muscov ite 8 Metallic Iron/ black 6 Black Fractur e Magnetic Magneti te 9 Pearly White 2 White Cleava ge Easily scratches Gypsu m- alabast er 10 Pearly Grey 1 White Cleave Greasy/ slippery feeling Talc 11 Transparen t Colorle ss 2.5 White Cleava ge Salty taste Halite 12 Pearly Black 2.5-3 colorle ss Cleava ge Think elastic type Mica- Biotite 13 Metallic/flat Black 1-2 Black Cleava ge Greasy/ slippery feeling Graphit e 14 Silky White 2 White Cleava ge Fibrous crystal Gypsu m-Satin Spar 15 Transparen t Colorle ss 2 White Fractur e Mica Gypsu m- Selenite 1. Between hematite and magnetite, which one has a red/brown streak? a. Hematite has a red/brown streak.

**Used to be two boxes each labeled 1-15, switching to single box labeled 1-30. Minerals are samples 1-15, rocks are samples 16-30. Rock Sample Number Texture Composition Other Observations if applicable Rock Name 1 (16) Glassy Alkali feldspar Natural glass, vitreous luster Obsidian 2 (17) Coarse- grained K-feldspar, quartz Hardness >5.5 Granite 3 (18) Fine-grained Plagioclase feldspar, pyroxene Dark, dense, 5-6 hardness Basalt 4 (19) Vesicular Feldspar, quartz Often floats Pumice 5 (20) Fine-grained K-feldspar, quartz Often porous Rhyolite 1. What is the difference between granite and rhyolite? a. Granite is a course-grained/much harder rock while rhyolite is a fine- grained rock. When lava cools and hardens under the Earth's surface, intrusive igneous rocks like granite are created. On the other hand, rhyolite is formed the same way except for on the earth’s surface, instead of under. 2. What rock is likely to have plagioclase feldspar, pyroxene, and some olivine, and have crystals large enough to see with the naked eye? a. Gabbro 3. In this image, there is a type of igneous rock. What is it?

a. Pumice, since it is floating, and it’s the only igneous rock that does. 4. Of the rock samples you have in your box, which of these are extrusive igneous rocks? a. Rhyolite 5. Name the two ultramafic rocks in the igneous powerpoint. Identify which is intrusive and extrusive. a. Periodotite - intrusive b. Komatiite - extrusive Part 3 Sedimentary Rocks (Use rock box, Sedimentary Rocks powerpoint, and Rock Identification Guide in the Lab powerpoint area of class) **Used to be two boxes each labeled 1-15, switching to single box labeled 1-30. Minerals are samples 1-15, rocks are samples 16-30. Rock Sample Number Texture Grain Size Other Observations if applicable Rock Name 6 (21) Very fine- grained <0.063 mm Compressed clay Shale 7 (22) Smooth 1/16mm-2mm Reacts w acid Travertine 8 (23) Clastic 0.06mm-2mm Dusty red in color Sandstone 9 (24) Clastic >2mm Coarse, uneven grains Conglomerate 10 (25) Fine grained 0.001mm Dense Limestone 5. How could you determine which cement is holding your sandstone together? a. By looking at its color, you can also use acid to determine. If it’s a gray color, it’s calcite cement. If it’s an orange, yellow, brown, or red tone, it’s oxide cement. 6. Based on the description of limestones in the lab powerpoint, what type of limestone is shown here?

1. What controls the mineral composition of a metamorphic rock? a. Temperature and pressure 2. What are two ways to quickly distinguish between marble and quartzite? a. Hardness test (Since marble is soft and granite is hard), or an acid test. 3. Identify the 4 foliated subtextures a. Slaty b. Phyllitic c. Schistose d. Gneissic 4. Identify the 3 nonfoliated subtextures. a. Granoblastic b. Porphyroblastic c. Glassy