The infinitely extended silicate ion shown in the picture below combines with calcium and magnesium to form the mineral diopside.What is the formula and charge of the repeating unit of the silicate ion? 
Definitions:
Endowed
Furnished or provided with a particular quality, ability, or asset.
Contract Curve
In an Edgeworth Box diagram, the locus of points representing the set of mutually beneficial allocations between two parties.
Edgeworth Box
A diagram used in microeconomics to show the distribution of resources between two consumers on a two-good world, demonstrating how trade can lead to Pareto improvements.
Utility Function
A mathematical representation that ranks individuals' preferences for bundles of goods or services, indicating levels of satisfaction.
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