Geology and Geophysics
GATE GG-1 Crystallography and mineralogy PYQs
Build your understanding with focused practice from past exam papers.
How to practice Crystallography and mineralogy
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 38. Imported answers require independent review unless marked reviewed.
Question 28
Open questionGGMCQ1 markNeeds review
A mineral has X = c, Y = b, Z = a, where X, Y, Z denote optical directions and a, b, c denote crystallographic axes. If X is the fast vibration direction and the mineral is optically positive, a {001} section will show which one of the following interference figures?
Your answerChoose one option.
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Which one of the following minerals is NOT formed by chemical weathering?
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 30
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Which one of the following is NOT a diagnostic parameter in identifying a crystalline phase using powder X-ray diffraction data?
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 37
Open questionGGMSQ1 markNeeds review
Which of the following statements related to crystal defects is/are CORRECT?
Your answerSelect all correct options. You can choose more than one.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 44
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A mineral under crossed nicols displays second order greenish-yellow (Δₘ = 740 nm) interference colour. On introduction of gypsum plate (Δₐ = 550 nm) along the length of the mineral orientation, first order grey interference colour is displayed. The net retardation is ________ nm (answer in integer).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 52
Open questionGGMCQ2 marksNeeds review
Match the mineral names in Group I with corresponding space groups in Group II.
Group-I: P. Diamond; Q. Coesite; R. Graphite; S. Calcite.
Group-II: 1. P6₃/mmc; 2. R3̅c; 3. Fd3̅m; 4. C2/c
Your answerChoose one option.
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Select the option that lists oxide minerals only.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 33
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From the following optical properties of minerals, select an appropriate option to identify the direction of analyser and polarizer if the available microscope is without a cross-hair.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 34
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Which one of the following minerals has crystallographic axes
and all interaxial angles equal to 90°?Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 57
Open questionGGMSQ2 marksNeeds review
Choose the correct option(s) that describe(s) the properties of clay minerals.
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