This is a type of quartz that is a mixture of Amethyst and Citrine, both varieties of quartz crystal. They will amplify the energy of the vibration of both of the stones that it is made up of. These are useful healing crystals for you to benefit from as they embody the energy of both of the above crystals, which may help you if you are studying. The vibration of these lovely stones is highly beneficial as they are a harmonious blend of the energies of both of the quartz varieties that they embody. The Citrine energy within this stone helps you to stay focused, as well as using the Amethyst vibration within it, the higher energies of the crown chakra, for inspiration.