Rough chunks of Mexican Blue Calcite raw crystal, each one is approx 45 - 55mm across. They come in a variety of shades, from a deeper cornflower blue to a much softer grey-blue shade. You will receive one Blue Calcite crystal, an example of the ones we have available are shown in the photos. Calcite is a calcium carbonate mineral that is found all over the world in a variety of forms and colours, often in combination with other minerals. The more common forms of Calcite are Orange, Blue, Green and Yellow, Iceland Spar is a clear double refractive variety that forms natural rhomboids. Mangano Calcite is a rare pink variety, with high quality specimens from Peru displaying pink and white banding. Black Calcite, also known as Shamanite, is another rare variety. Interestingly, Calcite and Aragonite are identical in chemical makeup, but crystallize differently to give us different crystals. Blue Calcite Healing Properties include: Soothes nerves and anxiety Helps recovery from illness Helps communication Powerful energy amplifier and cleanser Aids learning and memory Helps with new outlooks