Geology and Geophysics
GATE GG-1 topic:crystallography-mineralogy PYQs
Build your understanding with focused practice from past exam papers.
Questions 11–20 of 38. Imported answers require independent review unless marked reviewed.
Question 65
Open questionGGNAT2 marksNeeds review
The following table provides the mineral chemistry of a garnet. All oxides are in weight percentage and cations in atoms per formula unit. Total oxygen is taken as 12 based on the ideal garnet formula. Consider Fe as Fe
and Fe
= 0. The X
of this garnet is __________.Oxides | Wt % | Cations | apfu |
|---|---|---|---|
SiO | 39.51 | Si | 2.998 |
TiO | 0.05 | Ti | 0.003 |
Al O | 22.35 | Al | 1.999 |
Cr O | 0.00 | Cr | 0.000 |
FeO | 26.25 | Fe | 1.66 |
MnO | 0.00 | Mn | 0.000 |
MgO | 10.80 | Mg | 1.21 |
CaO | 1.40 | Ca | 0.114 |
Na O | 0.00 | Na | 0.000 |
K O | 0.00 | K | 0.000 |
Total | 100.36 | Total cation | 8.01 |
(Round off to three decimal places and do not multiply by hundred)
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Open questionGGMCQ2 marksNeeds review
The number of planes of symmetry in a tetrahedron is
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Open questionGGMSQ2 marksNeeds review
Which one or more of the following minerals shows O:Si ratio of 4:1 in its silicate structure?
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Open questionGGMCQ1 markNeeds review
Match the minerals in Group–I with the corresponding cleavage types in Group–II.
Group–I: P. Diopside; Q. Galena; R. Calcite; S. Fluorite
Group–II: 1. Cubic; 2. Octahedral; 3. Prismatic; 4. Rhombohedral
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Which one of the following optic signs is CORRECT for a mineral with the given centered optic axis figure?
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Which one of the following mineral pair shows solid solubility through coupled substitution of elements?
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Rhodocrosite in hand specimen is most likely to be confused with certain varieties of
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Which of the following is NOT an essential property of a mineral?
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The number of lattice points in a face-centered cubic unit cell is
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Open questionGGMCQ1 markNeeds review
All the faces of an octahedron can be collectively symbolized by
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