Sodalite
Sodalite generally has a deep blue colour (although it does have some rarer forms of the purple hackmenite variety) due to the high sodium content and exhibits an isometric structure and had a hardness of 5.5 to 6 on the mohs scale of hardness.
Sodailte has some quite rare crystalline varieties, but it is most often found in crystal shops in its dark blue massive variety, often in tumbled form. Sodalite is an excellent stone for working on the third eye and throat centres. This wonderful mineral provides an avenue for deep expansion and research. This stone helps the user to access deeper, stiller and more insightful states of being.
This is a great stone to use with meditation, mediumship and channelling.