A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
Agrellite | |
---|---|
General | |
Category | Inosilicates |
Formula (repeating unit) | NaCa2Si4O10F |
IMA symbol | Are[1] |
Strunz classification | 9.DH.75 |
Crystal system | Triclinic |
Crystal class | Pinacoidal (1) (same H-M symbol) |
Space group | P1 |
Identification | |
Color | White, grayish-white, greenish-white |
Crystal habit | Lath - shaped like a small, thin plaster lath, rectangular in shape |
Cleavage | perfect |
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 | [2][3] |
Agrellite (NaCa2Si4O10F) is a rare triclinic inosilicate mineral with four-periodic single chains of silica tetrahedra.
It is a white to grey translucent mineral, with a pearly luster and white streak. It has a Mohs hardness of 5.5 and a specific gravity of 2.8. Its type locality is the Kipawa Alkaline Complex, Quebec, Canada, where it occurs as tabular laths in pegmatite lenses.[4] Other localities include Murmansk Oblast, Russia, Dara-i-Pioz Glacier, Tajikistan, and Saima Complex, Liaoning, China.[4] Common associates at the type locality include zircon, eudialyte, vlasovite, miserite, mosandrite-(Ce), and calcite.[4]
Agrellite displays pink fluorescence strongly under shortwave and weakly under longwave ultraviolet light.[5][6] The fluorescent activator is dominantly Mn2+, with minor Eu2+, Sm3+, and Dy3+.[6]
It is named in honor of Stuart Olof Agrell (1913–1996), a British mineralogist at Cambridge University.
See also
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ http://www.mindat.org/min-57.html Mindat
- ^ http://www.webmineral.com/data/Agrellite.shtml Webmineral
- ^ a b c "Agrellite". www.mindat.org. Retrieved 2021-12-08.
- ^ "Handbook of Mineralogy". www.handbookofmineralogy.org. Retrieved 2021-12-08.
- ^ a b "Luminescence, fluorescence and phosphorescence of minerals". www.fluomin.org. Retrieved 2021-12-08.
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