WorksheetsMineralogy and Petrology
Total questions: 30
Worksheet time: 18mins
What is the Earth’s average geothermal gradient?
5 °C/km
25 °C/km
30 °C/km
50 °C/km
Which of the following minerals can be scratched by a copper coin?
Orthoclase
Calcite
Corundum
Diamond
What is the anorthite content of andesine?
An 0-10
An 50-70
An 30-50
An 70-90
What is the SiO2 abundance of dacite?
52 to 63%
45 to 52%
52 to 66%
63 to 66%
Which of the following contains gold?
Greenockite
Bornite
Sylvanite
Magnetite
Mid-Atlantic Ridge is composed mainly of ____.
Alkalic basalt
Calc-alkalic basalt
Alkali-calcic basalt
Tholeiitic basalt
It comprises all of the chemical, physical, and biological changes that a sediment undergoes during and after lithification in the near-surface environment.
Lithification
Catagenesis
Mesogenesis
Diagenesis
It is probably the most common cause of metamorphism.
Temperature
Pressure
Metamorphic fluids
Deviatoric stress
An opaque black, idiochromatic tourmaline species that has high magnetic susceptibilities due to high concentrations of iron.
Elbaite
Schorl
Liddicoatite
Biotite
A nickel-rich mineral present in meteorites.
Kamacite
Coprolite
Taenite
Enstatite
Glassy SiO2-rich volcanic with higher content than obsidian.
Spillite
Pitchstone
Hyalocastite
Perlite
Based on Total Alkalis vs. Silica Diagram, what is the SiO2 content of picrobasalt?
41 to 45 wt.%
45 to 52 wt.%
52 to 57 wt.%
37 to 41 wt.%
It is also known as fairy stone.
Erythrite
Muscovite
Sillimanite
Anorthite
Based on the Modified Wentworth Scale, what is the grain size of very fine sand?
1/32 to 1/16 mm
1/16 to 1/8 mm
1/8 to 1/4 mm
125 to 250 µm
It is a process in which new mineral phases are crystallized in the sediment or rocks during diagenesis.
Neomorphism
Catagenesis
Authigenesis
Petrogenesis
Generally, channel deposits are ____.
Very well sorted
Well sorted
Moderately sorted
Poorly sorted
It is the complete replacement of an old mineral by a new mineral with new crystal form.
Neomorphism
Pseudomorphism
Isomorphism
Allomorphism
Metamorphism for unstable types of protolith, begins at what range of temperature?
300 to 600 °C
150 to 300 °C
100 to 150 °C
150 to 600 °C
Based on the Knoop Scale, what is the hardness of Al2(SiO4)(F,OH)2?
560
820
1,340
1,800
What is the Mn-rich endmember of the wolframite series?
Wolframite
Ferberite
Scheelite
Hübnerite
Its objective is to provide a scheme for naming and describing metamorphic rocks.
Association on the Systematics Metamorphic Rocks (ASMR)
Subcommission on the Systematics of Metamorphic Rocks (SCMR)
Subcommittee on the Systematics of Metamorphic Rocks (SCMR)
International Union of Geological Sciences (IUGS)
What is the skewness of the sediments with excess coarse grains that are carried by waves and currents to offshore area?
Positive skew
Negative skew
Platy kurtik
Cannot be determined
Which of the following is not a peraluminous mineral?
Diopside
Muscovite
Corundum
Topaz
Which of the following is a sulfarsenate of copper?
Proustite
Bournonite
Jamesonite
Enargite
It has low degree of disorder and present in rocks formed at high pressures and lower temperatures.
Microcline
Sanidine
Orthoclase
Anorthite
Which of the following is a peralkaline rhyolite?
Charnockite
Camptonite
Cortlandite
Comendite
The temperature where olivine crystals begin to form.
800 °C
1,000 °C
1,200 °C
1,800 °C
What is the eutectic point of forsterite-silica phase diagram at atmospheric pressure?
1,470 °C
1,274 °C
1,585 °C
1,540 °C
Which of the following minerals will weather first?
Goethite
Gibbsite
Hematite
Zircon
It has a hardness of 5 parallel to the length of the crystal and a hardness of 7 when scratched along a direction perpendicular to the length.
Apatite
Quartz
Kyanite
Andalusite
