This mineral got its name from the latin coelestis (heavenly, skyey) word in 1799. The strontium sulfate is normally colorless, today its more known nice blue crystals origin from Madagascar, but from the sulfur mine near Tarnobrzeg, Poland nice yellowish crystals turned out. The bengal priests used them for coloring flames ’bengal fire’, because it paints the flames red. It usually issues in hydrothermal veins, but also occurs in sedimental and other rocks. Beside its grainy masses it can be found in tabular, columnar crystals, mostly in Italy, Morocco, Madagascar etc.