Department of Earth Science     Northeastern Illinois University

                                                                      J. Hemzacek homepage 

image courtesy of NASA

This webpage is the primary informational source for this class. 
Resources and detailed information that you will need to succeed
will be provided in class and on this page.

Review list for Exam - final version
Syllabus: "live" version, updated 13 Feb
                      includes topics and assignments

Web links for research and for fun
       an interesting and important article...

Course documents (printable versions)





Course Handouts
and Other Important Stuff

printable versions - as given in class:
course syllabus (schedule of topics)
course information (grading, etc.)


some documents are in .pdf form;     
if you do not have Adobe® Reader®,     
click here to download.      

Webs and images used in class:

igneous rock compositions:      1         2          3         2a  
silica polymorphs

feldspar twinning


virtual microscopes:
    Micrograph Viewer Online

 pyroxenes:  Orthopyroxene Page      augite     diopside


   other minerals:  
              extinction ||

mineral galleries:   g_finn

phase diagrams:    H2O         Al2SiO5          inosilicates      

animation:   cumulates
Igneous Rocks of Contintental Lithosphere

Browse Geochemical/Analytical Collection


Zen paper on Schreinemaker bundle construction
          extracted pages:   H2O        binary         ternary

slides for exercise

© 2013 J Hemzacek
Last updated 7 Feb 2013







WELCOME to Petrology
I am really looking forward to spending this semester with you, as we explore the science of Petrology and Petrography, expanding on the knowledge that you have already accumulated about rocks and minerals.

As indicated on your syllabus, there is not a specific, required text for this course.   However, your success in this class will require that you have (an) appropriate text reference(s) available.  In addition to the Earth Materials and/or Mineralogy text that you already have, I will have additional resources available in class.  You might also consider acquiring one of the Petrology texts that are listed on your syllabus - the ones that include all 3 main types of rocks are the most appropriate for this class.

I'm looking forward to a great semester with you!





Topics and Activities - "live" version.  This page will be regularly updated as needed, and due dates, assignment details, and reading topics
will be linked here for your reference.  Check this page regularly to stay current!!

 click on link for assignment details


TOPICS (schedule subject to change)

reading by topic
(with links to online resources)



Course outline; policies and expectations eview of mineral identification techniques and practice    

12 Sep


6 Feb

    Bowen article summary

11 Feb

13 Feb     set of 36 rocks completed:
18 Feb     Mole %, Wt % and plots due
20 Feb      
25 Feb      
27 Feb      

12 Dec

FINAL EXAM 4:00 - 5:50 p.m.

  note final exam schedule.





Return to top of Assignment page Return to Syllabus/ Schedule

Return to course homepage

 current/pending assignments                              scroll down for earlier assignments 


20 Feb You should have completed your descriptions and exploration of the igneous rocks, from our original set of 36.
18 Feb Complete and turn in the packet that was given to you in class on Wed, 13 Feb (mole %, weight %, ternary plots).
If you need extra pages from this packet, you may find it here, available for printing.
13 Feb originally requested that your overview of 36 rocks be done by today!  Let's keep working on those!
6 Feb Bowen article summary:  

When reading any scientific article, there are some basic aspects that you should be able to consider, and that you should be able to understand, if only in a rudimentary way, about the work that is reported.  I have listed some of these below, and want you to start by considering these aspects with respect to a fairly significant geologic report.

Read the Bowen article, and submit a brief summary of the following, in your own words:

1.  List some of the important considerations in this research; that is, what are some of the assumptions, prior work, and basic observations that led
     to undertaking this particular direction of research.
2.  Describe the general types of methods used for this research: what kinds of data were collected, and using what types of methods?
3.  Describe the conclusions reached by the author, and briefly comment on how these conclusions are supported by the data.

4.  What did you find to be most interesting in this article?
5.  What aspects did you find to be confusing/ unclear/ "over your head", or you had difficulty understanding the significance or the relationship 
      of that aspect, to the premise of the research and/or the conclusions that were reached?