A super blue collector’s stone from Germany’s Eifel region. Beautiful, but mostly small and very rare.
Formula: (Na,Ca)4-8Al6Si6(O,S)24(SO4,C1)1-2
Hardness: 6
Density: 2.44 – 2.50 g/cm3
Refractive Index: 1.490- 1.507 DR: 0.009
Color: blue
Countries of Origin: Germany
Birthstone: December