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Agrellite (NaCa2Si4O10F) is a mineral found in QuebecCanada. It is also known from few other areas.

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Mineralogy Database Dictionary

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General Information:
 Chemical Formula:
(Molecular Weight = 394.48 gm)
Sodium 5.83 % Na
Calcium 20.32 % Ca
Silicon 28.48 % Si
Oxygen 40.56 % 
Fluorine 4.82 % 
 Empirical Formula:
Alkalic igneous rocks of the Sheffield Lake complex.
 IMA Status:
Approved IMA 1973
Kipawa River, Villieu Township, Temiscaming County, Quebec, Canada.
 Name Origin:
Named for Stuart O. Agrell, British mineralogist, Cambridge University.
Physical Properties:
[110] Perfect, [110] Perfect, [010] Poor
white, grayish white, or greenish white.
2.88 - 2.9, Average = 2.88
Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape., ,
5.5 - Knife Blade
Vitreous - Pearly
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