Calcite is a very common crystal.  Marble and limestone is mostly calcite.  Lemurian Aquatine Calcite though is not very common.  It is a blue-green crystal found in a remote part of Argentina.  It's element is water and it links to the heart chakra.  It is said to be a great for relieving stress, anxiety, fears and worries.  It nourished the emotional body.  It aids in having and remembering dreams.  It helps you understand ancient civilizations.  It helps you develop more empathy toward others.  For healing, it aids the areas around the heart, throat, mouth and eyes.