Barium also named blanc fix, the chemical composition is BaSO4, the crystal is the orthogonal (orthorhombic) sulfate mineral crystal Normally showing as the thick plate or columnar crystal, for dense block or plate, granular aggregates. Colorless transparent when it’s pure, while dyed various colors when it’s impurity, white, shiny glass, transparent to translucent. Out of 3 directions and complete secondary cleavage, Mohs hardness is 3 to 3.5, the proportion is 4.5.