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GLG206 2012 exam 1328335110.pdf
GLG206_2012_exam_1328335110.pdf
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GLG206 2012 exam 1328335110.pdf-GLG 206 Materials ...
GLG206_2012_exam_1328335110.pdf-GLG 206 Materials of the Earth:
GLG206 2012 exam 1328335110.pdf-GLG...
GLG206_2012_exam_1328335110.pdf-GLG 206 Materials of the Earth:
Page 1
GLG 206 Materials of the Earth: Midterm
50 minutes
Please read the instructions of each of the questions. Total marks are 50. Your mark
will be rescaled to reflect a possible 17.5% of your final mark. DO NOT WRITE ON
THIS SHEET, only answers written in the workbook will be marked.
Section 1: Fully explain the following terms. Use examples and/or diagrams where
appropriate (8 listed, please define 5
. If you define more than 5 only the first 5 will
be marked; 3 marks each: 15
total)
a) Lustre
b) Diaphaneity
c) Tenacity
d) Unit cell
e) Polymorph
f) Contact twin
g) Mirror plane
h) Allochromatic
Section 2: Please answer the following three questions
, no options in this section.
A.
Name four elements that comprise > 1 wt. % of the Earth’s crust.
(2 marks)
B.
What is a mineral? Please be specific in your answer. (5 marks)
C.
What are the three factors that determine mineral growth? (3 marks)
Section 3:
List and fully explain the concepts below. Use examples and/or diagrams
where appropriate. (7 questions listed, you need to answer 5
. If you define more
than 5 only the first 5 will be marked; 5 marks each).
A.
Describe the differences between cleavage, parting and fracture. List at
least two examples of specific types of fracture.
B.
What are metallic bonds and what physical properties are characteristic of
compounds that contain metallic bonds?
C.
Draw the arrangement of the SiO
4
tetrahedra for the nesosilicates, and
make sure it is fully labeled with the unit composition as well. Give one
example of a nesosilicate and a physical property that is consistent
amongst the group.
D.
What are the six (or seven) crystal systems? Please use diagrams and or
fully describe the differences.
GLG 206 Midterm, Dr. K Tait
October 18, 2011
Page 2
E.
Discuss the two primary packing arrangements in minerals, using
diagrams.
F.
Calculate the electrostatic valency for the following atoms in octahedral
coordination and label the six bonds with the answer. What is the net
valency charge of this complex?
How much charge is available for each
chlorine ion to contribute to another bond?
G. Which tetrahedral coordination is the most stable? Why? (In your
workbook list (a), (b) or (c) or draw the configuration)
GLG 206 Midterm, Dr. K Tait
October 18, 2011
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