How would you represent an ion pair and ionic compound the ions form?

For those who are not familiar with Calcium Flouride. This is an inorganic compound of calcium and fluorine. This is normally used in the laboratory. There are also times when this may be used in other industries.

This can be mixed with other reactive agents so that it can melt different types of metals. This can be the window material for checking out ultraviolet rays and infrared wavelengths. This is transparent so this is perfect for this purpose. This is also known to have a low refractive index. It can always be fascinating to know more about chemistry and the way that different formulas mix together.