Angelite is a form of anhydrate that is blue. It is not a common mineral as it easily alters to the much more common mineral gypsum from the addition of water to its chemical structure. (This is fair warning not to put these stones in water and perhaps even to store them with silica gel) The name anhydrite literally translates to without water (Ari Hydra)
The heart has long been used as a symbol to refer to the spiritual, emotional, moral, and in the past, the intellectual core of a human being. As the heart was once widely believed to be the seat of the human soul, the word heart continues to be used poetically to refer to the soul, and stylized depictions of hearts are used as prevalent symbols representing love.

Angelite is a wonderful communion stone. Helps one hear and speak from the soul. It helps access angelic realms and angelic protection. 

It is believed to bring blessings and protection from the Angels to have a piece of Angelite in your home. 

Some people bless their homes with a protection grid with Angelite in all four corners of their home.