Concept explainers
Mica is a sheet silicate while quartz is a network silicate. On the basis of its silicate structure, which mineral has a higher percentage composition of silicon? (Silicon to oxygen ratio is 2:5 for a sheet and 1:2 for a network.)
The mineral that contains higher percentage silicon from mica and quartz.
Answer to Problem 6PEB
Solution:
Quartz
Explanation of Solution
Given data:
Silicon to oxygen ratio is 2:5 for a sheet and 1:2 for a network.
Formula used:
Write the mass percent of an element in a compound can be found from:
Explanation:
For mica:
The formula for a single tetrahedra based on ratio:
The formula weight of a single tetrahedra:
Recall the mass percent of an element in a compound:
Substitute
For Quartz:
The formula for a double based on ratio:
The formula weight of a single tetrahedra:
Recall the mass percent of an element in a compound and it can be found from:
Substitute
Conclusion:
Quartz has the higher percent of silicon.
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