Just in case you are wondering why people are mentioning the small chip out of the blade in the first photo, such chips can cause localised stress concentration at the
point (sharp corner) of the chip. This is why engineers design rounded corners in certain items. Those concentrations can start a crack that grows across the blade.
Secondly, the mavic mini uses staggering motor rpm's, I am fairly sure I have seen 14,000rpm reported in the DATs from my mavic mini and possibly 16,000rpm. I suspect the
Mini 2 will have similar rpms.
From an engineering point of view, circular motion is an acceleration and its size is proportional to the radius of the path and the square of the rpm.
If you go to the bottom of the webpage
Centripetal and Centrifugal Acceleration Force
you will find an accelerataion calculator based on rpm & radius.
At a guess your chip is about 0.055m from the motor centre, I won't spoil the fun for you but try typing in some rpm and a radii of .055m and see what values you get for the accelerations at that radius. Look at the "g" value (last box), that's the number of times that the acceleration is greater than gravity.
As far as the acceleration is concerned the mass is irrelevant, but mass comes into consideration when you start considering other effects e.g. balance and stresses.
With regards to replacing blades, if you need to replace one blade on a motor replace both blades on that motor, they are most likely matched for balance pairs.