Hellenica World

Agrellite

Agrellite
General
Category Silicate minerals
Chemical formula NaCa2FSi4O10
Identification
Color White, grayish-white, greenish-white
Crystal habit Lath - shaped like a small, thin plaster lath, rectangular in shape
Crystal system Triclinic
Cleavage perfect [110]
Mohs Scale hardness 5.5
Luster pearly
Refractive index nα = 1.567 nβ = 1.579 nγ = 1.581
Optical Properties biaxial
Birefringence δ = 0.014
Streak white
Specific gravity 2.88
Diaphaneity transluscent
References [1][2]

Agrellite (NaCa2FSi4O10) is a mineral found in Quebec, Canada. It is also known from few other areas.

It is named in honour of Stuart Olof Agrell. [3]


References

  1. ^ http://www.mindat.org/min-57.html Mindat
  2. ^ http://www.webmineral.com/data/Agrellite.shtml Webmineral
  3. ^ first reported in the Canadian Mineralogist (1976), vol. 14, pp. 120-126









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