General Information:
Chemical Formula:
(Na,Ca)4Zr2Ti(CO3)4O4
Composition:
(Molecular Weight = 634.87 gm)
Sodium 12.67 % Na
Calcium 3.16 % Ca
Zirconium 28.74 % Zr
Titanium 7.54 % Ti
Carbon 7.57 % C
Oxygen 40.32 % O
Empirical Formula:
Na3.5Ca0.5Zr2Ti(CO3)4O4
Environment:
Dawsonite-rich sill.
IMA Status:
Approved IMA 1978
Locality:
St. Michel, Montreal Island, Canada.
Name Origin:
Named for Ann Phyllis Sabina Stenson (1930-), mineralogist, Geological Survey of Canada.
Physical Properties:
Cleavage:
[001] Perfect, [100] Distinct
Color:
colorless, white, or light yellow.
Density:
3.36
Habits:
Powdery - Forms a loose, poorly-coherent pulverulent mass., ,
Luster:
Earthy (Dull)
Streak:
white
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