LithoCat

MineralThomsonite-Ca
FormulaNaCa2Al5Si5O20 • 6(H2O)
Crystal FormOrthorhombic/Dipyramidal [2/m 2/m 2/m]
Cleavage[101] Perfect, [100] Good
ColorColorless, Greenish, Yellow, White, Pink
Density2.3 – 2.4 g/cm3
DiaphaneityTransparent to translucent
FractureConchoidal
Hardness5.0 - 5.5
LustreVitreous
StreakWhite
Dana 8 Class77.1.5.9
Strunz ClassVIII/J.21-70
Mindatmindat.org
WebMineralWebMineral
ID47