Does the preparation of capsules with 100 mg of Znsulfate and 500 mg of gelatine require special precautions?

I suspect a difference in particle size and view for both of these components. ZnSO4 crystalline and gelatin small light brown granules. Of both, I suspect that zinc sulfate is the easiest to crush. To obtain a very fine powder, which may stick to the gelatin grains, I would grind the crystals in a coffee grinder.