Clear quartz is a really great stone for transmuting light. People often  use it to cleanse and purify their energy. You can take a clear quartz and go around your aura just to strengthen it you can go ahead and use a clear quartz for meditation purposes if you are having an issue with clarity. Many people referred to this stone as a master healer. I recommend it to my clients if they’re in environments and there’s a lot of negative energy. It helps transmute  energy for them.
This is a great size for meditation they are from 9g-19g