Agrellite

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Agrellite
Museo di mineralogia, pietre fluorescenti, agrellite 3.JPG
General
Category Inosilicates
Formula
(repeating unit)
NaCa2Si4O10F
Strunz classification 09.DH.75
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
Streak white
Diaphaneity transluscent
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]

References[edit]

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