Go to: Midterm Exam
Geology (GLGY 423-UCAL) Final
Some questions have hints and explanations. Click Start to begin.
Start
Congratulations - you have completed Geology (GLGY 423-UCAL) Final.
You scored %%SCORE%% out of %%TOTAL%%.
Your performance has been rated as %%RATING%%
Your answers are highlighted below.
Question 1 |
High temperature and/or dry conditions favors the growth of __I__ crystals over __II__ crystals.
A | I. olivine II. pyroxenes |
B | I. orthopyroxenes II. clinopyroxenes |
C | I. pyroxenes II. olivine |
D | I. hydrous II. anhydrous |
E | I. clinopyroxenes II. orthopyroxenes |
Question 2 |
The chemical formula for the Pyroxene end-member Enstatite is MgSiO3.
A | True |
B | False |
Question 3 |
In X-ray Diffraction Pattern Analysis, the high intensity regions will be recorded as...
A | narrower (thinner) peaks. |
B | higher (high amplitude) peaks. |
C | lower (low amplitude) peaks. |
D | thicker (fatter) peaks. |
Question 4 |
The "phase-diagrams" are used to describe what type of chemical reactions?
A | Rock forming chemical reactions. Hint: Not the best choice out of the given choices here. |
B | Chemical reactions involving solid materials. |
C | Reversible chemical reactions. |
D | Organic chemical reactions. |
E | Chemical reactions occurred in solid solutions. |
Question 5 |
Does (123) plain lines in the [210] zone?
A | Yes |
B | No |
Question 5 Explanation:
No because (1X2) + (2X1) + (3X0) is not equal to zero.
Question 6 |
What is the chemical formula for Anthophyllite?
A | Ca2Fe5Si8O22(OH)2 |
B | Fe7Si8O22(OH)2 |
C | Ca2Mg5Si8O22(OH)2 |
D | Mg7Si8O22(OH)2 |
Question 7 |
The T-O-T offsets structures in clinopyroxenes are situated in such...
A | all facing the same direction. |
B | randomly arranged T-O-Ts alternates every two chains. |
C | longer a - axis compared to the a-axis length of the orthopyroxenes. |
D | alternating between positive and negative faces. |
Question 8 |
Garnets are isotropic minerals.
A | False |
B | True |
Question 8 Explanation:
Not always buddy!
Question 9 |
Alkali feldspars may have several different types of exsolutions. Which of the following type of exsolution can only be observed under X-ray techniques?
A | Cryptoperthite |
B | Microperthite |
C | Antiperthite |
D | Macroperthite |
E | Perthite |
Question 10 |
Minerals with same/similar structure but different compositions is known as...
A | polymorphs |
B | ordered |
C | disordered |
D | isomorphs |
Question 11 |
The analytical methods, ICP and AAS will destroy the tested sample and often the same sample cannot be used for further analysis.
A | False |
B | True |
Question 12 |
Which of the following is the most dense mineral group in terms of it's chemical structure?
A | Olivines |
B | Amphiboles |
C | Pyroxenes |
Question 13 |
Electromagnetic radiation is always....
A | destructive |
B | constructive |
C | confined and non-scattering |
D | constructive and destructive |
Question 14 |
What is the Miller index for 10a: 3b: 5c?
A | (1/10 1/3 1/5) |
B | (5 3 10) |
C | (10 3 5) |
D | (3 10 6) |
E | (1 5 3) |
Question 15 |
Which of the following planes lines on the [1 1 1] zone?
A | (121) |
B | (122) |
C | (212) |
D | (132) |
E | (112) |
Question 16 |
What is the crystal system and the optic sign of the following crystal?
Image credit: Zoltai and Stout (1985) Mineralogy: Problems and solutions
Image credit: Zoltai and Stout (1985) Mineralogy: Problems and solutions
A | Orthorhombic / positive |
B | Monoclinic / positive |
C | Triclinic / positive |
D | Triclinic / negative |
E | Orthorhombic / negative |
F | Monoclinic / negative |
Question 17 |
Abundance of water in a olivine forming environment will result in formation of serpentine and talc.
A | False |
B | True |
Question 18 |
Which cut will provide a Bxo figure for the following crystal?
Image credit: Zoltai and Stout (1985) Mineralogy: Problems and solutions
Image credit: Zoltai and Stout (1985) Mineralogy: Problems and solutions
A | 001 |
B | 100 |
C | 110 |
D | 101 |
E | 111 |
Question 19 |
Polymorphism is caused by differences in thermodynamic properties at different P-T conditions.
A | True |
B | False |
Question 20 |
What are the bottom two end-members of Olivine ternary diagram?
A | Ferrosilite and Faylite |
B | Ferrosilite and Enstatite |
C | Forsterite and Enstatite |
D | Faylite and Enstatite |
E | Forsterite and Ferrosilite |
F | Forsterite and Faylite |
Question 21 |
Which of the following analytical methods should you use for determining the crystal structure of a mineral? (choose the best answer)
A | SEM (Scanning Electron Microscope) |
B | Electron Microprobe |
C | ICP and AAS |
D | XRF (X-Ray Fluorescence) |
E | X-ray Diffraction |
Question 21 Explanation:
While none of the above techniques world provide good details on crystal structures, the X-ray Diffraction is the best choice.
Question 22 |
Given the following information, calculate the wavelength in nm.
Birefringence: 0.024
Thickness of the slide: 0.03 mm
Birefringence: 0.024
Thickness of the slide: 0.03 mm
A | 650 nm |
B | 560 nm |
C | 5.60 10-4 nm |
D | 7.20 x 10-4 nm |
E | 720 nm |
F | 2.14 -3 nm |
Question 22 Explanation:
Question 23 |
__I__ temperature reactions will result in __II__.
A | I. high II. ordered minerals. |
B | I. low II. disordered minerals. |
C | I. low II. high symmetry. |
D | I. high II. low symmetry. |
E | I. high II. high symmetry. |
Question 24 |
In plagioclase solid solution composition diagram, the Albite melting occur at ____ Anorthite melting point.
A | same temperature as |
B | high temperatures compared to |
C | low temperatures compared to |
Question 25 |
Which of the following is the best way to identify a mineral?
A | Refractive Index |
B | Chemical composition analysis. |
C | Properties in hand sample (physical properties) |
D | Interference Figure |
E | Birefringence |
Question 26 |
What is the best description for the following effect in Calcite crystals?
A | This is caused by the difference in Birefringence. |
B | This is a result of internal diffraction of natural light. |
C | This is an optical property caused by non-visible UV light interacting with the visible light spectrum. |
D | This is caused by the difference in velocities between the epsilon and omega rays. |
E | This is an optical property that would only occur in Calcite crystals. Hence it is a good property for mineral identification. |
Question 27 |
What is the universally accepted standard thickness of a petrographic thin section?
A | 30 000 nm |
B | 0.03 nm |
C | 0.003 mm |
D | 0.35 mm |
E | 0.30 mm |
Question 27 Explanation:
Remember, 30 000 nm = 0.03 mm
Question 28 |
Which of the following is the most dense mineral in terms of it's chemical structure?
A | Sillimanite |
B | Andalusite |
C | Epidote |
D | Carbonates |
E | Kyanite |
Question 29 |
The length fast direction is at ___ degrees to the length slow direction.
A | 45 |
B | 90 |
C | 180 |
D | between 45 - 90 |
E | between 90 - 180 |
Question 30 |
The best property to identify feldspars is the unique twining.
A | False |
B | True |
Question 30 Explanation:
"In metamorphic rocks, and in low temperature diagenetic rocks in which secondary feldspars may grow, feldspars are typically untwinned." - Dr. Sytle Antao
Question 31 |
Given the following information, calculate the 2θ angle.
λ = 0.3419 m
d210 = 3.92564 Å
n = 1
λ = 0.3419 m
d210 = 3.92564 Å
n = 1
A | 2.495 degrees |
B | 11.48 degrees |
C | 4.992 degrees |
D | 22.96 degrees |
E | 6.495 degrees |
Question 31 Explanation:
Don't forget it is asking for 2θ not theta; = 2.495 degrees.
Question 32 |
Uniaxial minerals can have inclined extinction.
A | True |
B | False |
Question 32 Explanation:
straight and symmetrical only
Question 33 |
What is the crystal system and the optic sign of the following crystal?
Image credit: Zoltai and Stout (1985) Mineralogy: Problems and solutions
Image credit: Zoltai and Stout (1985) Mineralogy: Problems and solutions
A | Monoclinic / positive |
B | Triclinic / positive |
C | Orthorhombic / positive |
D | Triclinic / negative |
E | Monoclinic / negative |
F | Orthorhombic / negative |
Question 34 |
The chemical formula for the Pyroxene iron end-member Orthoferrosilite is Fe2SiO3.
A | True |
B | False |
Question 34 Explanation:
FeSiO3 would be correct.
Question 35 |
The following interference diagram can be best described as...
A | a biaxial Bxa positive. |
B | a biaxial Bxa negative. |
C | a biaxial optic axis. |
D | an uniaxial optic axis. |
E | an uniaxial Bxa negative. |
Question 36 |
__I__ are low-T, slow cooled alkali feldspars and their Optic Axis Plane (OAP) is __II__ to 010.
A | I. Sanidine and Orthoclase II. perpendicular |
B | I. Microcline and Orthoclase II. perpendicular |
C | I. Microcline and Sanidine II. parallel |
D | I. Microcline and Sanidine II. perpendicular |
E | I. Microcline and Orthoclase II. parallel |
Once you are finished, click the button below. Any items you have not completed will be marked incorrect.
Get Results
There are 36 questions to complete.
← |
List |
→ |
Return
Shaded items are complete.
1 | 2 | 3 | 4 | 5 |
6 | 7 | 8 | 9 | 10 |
11 | 12 | 13 | 14 | 15 |
16 | 17 | 18 | 19 | 20 |
21 | 22 | 23 | 24 | 25 |
26 | 27 | 28 | 29 | 30 |
31 | 32 | 33 | 34 | 35 |
36 | End |
Return
You have completed
questions
question
Your score is
Correct
Wrong
Partial-Credit
You have not finished your quiz. If you leave this page, your progress will be lost.
Correct Answer
You Selected
Not Attempted
Final Score on Quiz
Attempted Questions Correct
Attempted Questions Wrong
Questions Not Attempted
Total Questions on Quiz
Question Details
Results
Date
Score
Hint
Time allowed
minutes
seconds
Time used
Answer Choice(s) Selected
Question Text
All done
Need more practice!
Keep trying!
Not bad!
Good work!
Perfect!
You may download this exam as a PDF file here.
Credits: Based on the excellent class notes provided by, Dr. Sytle Antao during Fall 2013.
FAQ | Report an Error.