GATE GG-1 · 2025 · GG
Question 65: Crystallography and mineralogy
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Question 65
GGNAT2 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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2025GG
GATE GG-1 2025 · Paper 1
Geology and Geophysics · Original paper archive
- Section
- Section GG
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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