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Museo di mineralogia, pietre fluorescenti, agrellite 3.JPG
Category Inosilicates
(repeating unit)
Strunz classification 9.DH.75
Crystal system Triclinic
Crystal class Pinacoidal (1)
(same H-M symbol)
Space group P1
Color White, grayish-white, greenish-white
Crystal habit Lath - shaped like a small, thin plaster lath, rectangular in shape
Cleavage perfect [110]
Mohs scale hardness 5.5
Luster pearly
Streak white
Diaphaneity translucent
Specific gravity 2.88
Optical properties biaxial
Refractive index nα = 1.567 nβ = 1.579 nγ = 1.581
Birefringence δ = 0.014
References [1][2]

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

Agrellite displays pink fluorescence under both shortwave and longwave ultraviolet light.[3]

It is named in honour of Stuart Olof Agrell (1913–1996).[4]


  1. ^ Mindat
  2. ^ Webmineral
  3. ^ Handbook of Mineralogy
  4. ^ first reported in the Canadian Mineralogist (1976), vol. 14, pp. 120-126