Thaumasite

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Thaumasite[1][2]
Mineralogical name Thaumasite
Chemical name Calcium silicate carbonate sulfate dodekahydrate
Trivial name
Chemical formula Ca3Si(OH)6(CO3)(SO4)•
12H2O
Other forms
Crystal system
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C
Density (g/cm³) 1.88-1.9 g/cm3
Molar volume
Molar weight 622.4 g/mol
Transparency transparent to translucent
Cleavage indistinct to poor
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments insoluble in water
Crystal Optics
Refractive Indices no = 1.491
ne = 1.470
Birefringence Δ = 0.039
Optical Orientation negative
Pleochroism
Dispersion
Used Literature



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