General Information:
Chemical Formula:NaCa2Si4O10F
Composition:(Molecular Weight = 394.48 gm)Sodium 5.83 %
NaCalcium 20.32 %
CaSilicon 28.48 %
SiOxygen 40.56 %
O Fluorine 4.82 %
F Empirical Formula: NaCa2(Si4O10)F
Environment:Alkalic igneous rocks of the Sheffield Lake complex.
IMA Status:Approved IMA 1973
Locality:Kipawa River, Villieu Township, Temiscaming County, Quebec, Canada.
Name Origin:Named for Stuart O. Agrell, British mineralogist, Cambridge University.
Physical Properties: Cleavage:[110] Perfect, [110] Perfect, [010] Poor
Color:white, grayish white, or greenish white.
Density:2.88 - 2.9, Average = 2.88
Diaphaniety:Translucent
Habits:Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape., ,
Hardness:5.5 - Knife Blade
Luminescence:Fluorescent.
Luster:Vitreous - Pearly
Streak:white
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