General Information:
Chemical Formula:Na4Zn2Si7O18·5(H2O)
Composition:(Molecular Weight = 797.40 gm)Sodium 11.53 %
NaZinc 16.40 %
ZnSilicon 24.65 %
SiHydrogen 1.26 %
H Oxygen 46.15 %
O Empirical Formula: Na4Zn2Si7O18·5(H2O)
Environment:In a cavity in a sodalite syenite xenolith near a contact of hornfels and nepheline-sodalite syenite.
IMA Status:Approved IMA
Locality:Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada.
Name Origin:Named after Robert Allan Gault (1943- ) of the Canadian Museum of Nature.
Physical Properties: Cleavage:[101] Perfect, [010] Perfect, [021] Poor
Color:colorless or pale mauve.
Density:2.52
Diaphaniety:Transparent
Habits:Crystalline - Fine - Occurs as well-formed fine sized crystals., ,
Hardness:6 - Orthoclase
Luminescence:Fluorescent, Short UV=bright green.
Luster:Vitreous (Glassy)
Streak:white
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