As stated above most gemstones emit an energy of their own and so I don't believe that any act to disrupt magical in general although there are many that can be used as protection against unwanted magical energies (quartz for example), to absorb negative energy (jet) or to help convert it into positive (black tourmaline).
All such stones act as protection against unwanted energies, they won't disrupt spell casting but they help in shielding you from others.
Not all energies work well with each other, so it can cause some unpleasantries that may seem bad, but really just are not. If you want to look into that, look into crystals that have an emphasis on shielding (stopping, dispersing other energy) or a crystal that causes a natural brutch (disturbs Magickal energy). A brutch is caused when there are energies that do not work well with each other and causes a sort of displacement. It happens in the natural world, but it depends on the crystal itself rather than a type of crystal.