Agrellite
| Agrellite | |
|---|---|
 | |
| General | |
| Category | Inosilicates |
| Formula (repeating unit) | NaCa2Si4O10F |
| Strunz classification | 9.DH.75 |
| Crystal system | Triclinic |
| Crystal class |
Pinacoidal (1) H-M symbol: (1) |
| Identification | |
| 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]
References
 |
Wikimedia Commons has media related to Agrellite. |
- ↑ http://www.mindat.org/min-57.html Mindat
- ↑ http://www.webmineral.com/data/Agrellite.shtml Webmineral
- ↑ Handbook of Mineralogy
- ↑ first reported in the Canadian Mineralogist (1976), vol. 14, pp. 120-126
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