As its name might suggest, Optical calcite has been found beneficial by many when looking to gain clarity and insight. Some people feel this is an lovely stone to help shift your focus when negative emotions take center stage. The funny thing about this stone helping with focus and clarity, is when you look through it at text on a paper, the image doubles and is a bit blurry. This optical phenomenon is called double refraction and is one of the reasons people love this stone so much. The yellow variety of optical calcite resonates well with solar plexus energies. Try placing one on that area during meditation and see if you can feel the sense of hope the energies provide from this stone.