General Information:
Chemical Formula:NaAl(CO3)(OH)2
Composition:(Molecular Weight = 126.99 gm)Sodium 18.10 %
NaAluminum 21.25 %
AlHydrogen 0.79 %
H Carbon 9.46 %
C Oxygen 50.40 %
O Empirical Formula: NaAl(CO3)(OH)
Locality:Feldspathic dike near McGill university, Montreal, Canada.
Name Origin:Named after the Canadian geologist, J. W. Dawson (1820-1899).
Physical Properties: Cleavage:[110] Perfect
Color:colorless or white.
Density:2.4 - 2.44, Average = 2.42
Diaphaniety:Transparent
Habits:Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Acicular - Occurs as needle-like crystals., Encrustations - Forms crust-like aggregates on mat rix.
Hardness:3 - Calcite
Luminescence:Fluorescent, Short UV=dull white.
Luster:Vitreous - Silky
Streak:white
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