HW4: Rock Report

Learning Goals: 

  • Describe an unfamiliar igneous, sedimentary, or metamorphic rock using terms learned in this class

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HW4: Rock Report

Submission: via Canvas Quiz (next page)

Instructions: Complete the homework. You may talk among yourselves about different strategies, but you may NOT copy answers from other students (this won’t help you anyway since each student will be researching a different rock). Make sure everything you write is in your own words, and be careful to cite any sources for information. DO NOT START THE QUIZ UNTIL YOU’VE FINISHED YOUR REPORT! 

This is an individual homework that shouldn’t require too much of your time.. But it’s important to follow these rules:

  • First, and most important, everything you write must be in your own words. You may not copy and paste material from other sources (of course not!). You may not use quotation marks either to get around this restriction. Every word must be your own.
  • I know that for some students in this class English is not your first language. I am totally in awe of your ability to take a class in English (if I had to take a class in one of my foreign languages . . . let’s just say it wouldn’t go well). But just because your English isn’t perfect doesn’t give you the right to copy/paste or use other people’s words. I do not care if you make grammatical or stylistic mistakes–I’m only interested in the content. Resist the temptation to “improve” your report by borrowing phrases and sentences from a native-English source.
  • You will need to do some research, but you should use as a foundation what you’ve learned about rocks from your readings. This means that if you have a metamorphic rock, for example, that you apply what you’ve learned about metamorphic rocks. Do not “re-learn” everything about metamorphic rocks by searching online–use the concepts and language that is presented in the readings.
  • As directed in the instructions, you should underline and define every word that you had to learn. These definitions must be in your own words and must not include other words that are unfamiliar (unless you define them too). For example, if you’re unfamiliar with the rock “syenite” (which is to be expected!), then you can’t simply describe it as an “undersaturated igneous rock” because you don’t know what “undersaturated” means either (why would you?!?). Going back to the first point, every word must be your own and you must understand it. 
  • Look at the example. I am not expecting a report much longer than this (a single paragraph), but it must include a description of all minerals found in the rock along with the mineral’s composition and structure (e.g., if it’s a silicate I want to know if it’s a layer silicate or framework silicate or whatever). Also note that there are other terms used to describe silicates like “tektosilicates” and “phyllosilicates” that are in common use–these are alternate words for the terms I used, and if you choose to use them you should define them like any other unfamiliar word. But, honestly, it would be more useful to you to simply use the terms I used to describe these minerals (e.g., island silicates, single-chains, double-chains, etc.).
  • Don’t leave it to the last minute and feel free to contact me or Matt if you need help.

THE ROCK THAT I CHOOSE IS: Hornfels

GLY3850Homework:

Rock Report
Name:

This is an individual homework activity on rocks and minerals. Each student must produce a one-page research report on

an assigned rock. You can sign up for a rock on Teams (same way you signed up for a country); students who haven’t

chosen one by Wednesday, 2/10 will have them assigned for them by me. The rocks include igneous, sedimentary, and

metamorphic rocks. This homework is worth 100 points.

Do not start this homework until you’ve finished all the lessons through M4.8. It is due on Wednesday, February 17th at

midnight.

Your rock report must describe the chemistry and mineralogy of your rock and its included minerals, and explain where

and how the rock forms. But this part is very important:

You must underline and define any words or terms you use that are not part of the vocabulary learned in this

class. If we’ve used a term in this class then you don’t need to define it. For example, it is OK to simply say that

granite has a felsic composition, because you have learned the term felsic in this class. It is not OK to say that

granite may have a rapakivi texture with large round orthoclase crystals because your readings haven’t

included the terms “rapakivi” or “orthoclase”. If you need to use these terms you must define them in your own

words.

In fact, everything you write must be in your own words! Plagiarism will result in a grade of FF for the class.

Here’s an example for the rock Granite:

Granite is an igneous rock with a phaneritic texture. It has a felsic composition. The most common minerals in

granite are quartz, potassium feldspar (sometimes called orthoclase), plagioclase feldspar, biotite and

amphibole. Quartz is a framework silicate with the composition SiO2. Potassium feldspar or orthoclase is a

framework silicate with the formula KAlSi3O8. Plagioclase feldspar is a framework silicate with a composition

between NaAlSi3O8 and CaAl2Si2O8. In granite, the plagioclase tends to be rich in Na. Biotite is a trioctahedral

layer-silicate mica rich in Fe and Mg. Amphibole is a double-chain silicate, and the variety common in granite is

called hornblende, which is a dark-colored mineral rich in Na, Fe, Mg, and Al. Some granites also contain

muscovite, which is a dioctahedral layer-silicate mica rich in Al.

Granites are common in continental arcs formed above subduction zones. They form when felsic magma cools

slowly underground. Granites often form large batholith or stock bodies like the Sierra Nevada Batholith, or

the Idaho Batholith.

References: [to be provided]

In this example the italicized words are ones you’ve learned from the readings and the underlined words are new. You

don’t have to italicize the familiar words, but you do have to underline and define the new words that you’ve learned.

For each mineral in your rock, you should describe how it is classified, and for silicates you should describe both its

chemistry and structure (e.g., “plagioclase feldspar is a framework silicate with a composition between NaAlSi3O8 and

CaAl2Si2O8. In granite, the plagioclase tends to be rich in Na.”)

Your rock report doesn’t need to be much longer than this example and should include references you used in your

research. Your report must include a description of the structure and chemistry of any minerals found in your rock.

Type your report in a word-processing program and save as a file. You will copy and paste the report into a Canvas Quiz

that will serve as a repository of your homework.

These are your choices:

Eclogite

Troctolite

Websterite

Garnet lherzolite

Anorthosite

Gabbro

Diorite

Granodiorite

Tonalite

Quartz diorite

Monzonite

Syenite

Dunnite

Basalt

Basaltic andesite

Andesite

Dacite

Rhyolite

Trachyte

Trachy-andesite

Trachy-basalt

Picrite

Latite

Carbonatite

Welded tuff

Mugearite

Hawaiite

Quartzite

Marble

Hornfels

Serpentinite

Slate

Phyllite

Greenstone

Garnet schist

Meta-conglomerate

Gneiss

Chlorite schist

Amphibolite

Blueschist

Migmitite

Mylonite

Cataclastite

Granulite

Skarn

Micrite

Quartz sandstone

Arkose

Graywacke

Siltstone

Mudstone

Shale

Breccia (sedimentary)

Conglomerate

Rock gypsum

Rock salt

Oolitic limestone

Anthracite coal

Bituminous coal

Lignite coal

Chert

Banded iron formation

Phosphorite

Peat

Fossiliferous limestone

Coquina

Chalk

Travertine

Obsidian

Pumice

Scoria

Tufa

Tillite

Torbanite

Komatiite

Foidolite

Pseudotachylite

Suevite

Soapstone

Diatomite

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