Agrellite: Difference between revisions
Infobox - added image caption text "Agrellite in fluorescent light" |
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| category = [[Inosilicates]] |
| category = [[Inosilicates]] |
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| image = Museo di mineralogia, pietre fluorescenti, agrellite 3.JPG |
| image = Museo di mineralogia, pietre fluorescenti, agrellite 3.JPG |
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| caption = Agrellite in |
| caption = Agrellite showing fluorescence in ultraviolet light |
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| formula = NaCa<sub>2</sub>Si<sub>4</sub>O<sub>10</sub>F |
| formula = NaCa<sub>2</sub>Si<sub>4</sub>O<sub>10</sub>F |
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|IMAsymbol=Are<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> |
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| molweight = |
| molweight = |
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| strunz = 9.DH.75 |
| strunz = 9.DH.75 |
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'''Agrellite''' ([[ |
'''Agrellite''' ([[Sodium|Na]][[Calcium|Ca]]<sub>2</sub>[[Silicon|Si]]<sub>4</sub>[[Oxygen|O]]<sub>10</sub>[[Fluorine|F]]) is a rare triclinic inosilicate [[mineral]] with four-periodic single chains of silica tetrahedra. |
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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.<ref name=":0">{{Cite web|title=Agrellite|url=https://www.mindat.org/min-57.html|access-date=2021-12-08|website=www.mindat.org}}</ref> Other localities include Murmansk Oblast, Russia, Dara-i-Pioz Glacier, Tajikistan, and Saima Complex, Liaoning, China.<ref name=":0" /> Common associates at the type locality include [[zircon]], [[eudialyte]], [[vlasovite]], miserite, mosandrite-(Ce), and [[calcite]].<ref name=":0" /> |
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Agrellite displays pink [[fluorescence]] under both shortwave and longwave ultraviolet light.<ref>[http://rruff.geo.arizona.edu/doclib/hom/agrellite.pdf Handbook of Mineralogy]</ref> |
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Agrellite displays pink [[fluorescence]] strongly under shortwave and weakly under longwave [[ultraviolet light]].<ref>{{Cite web|title=Handbook of Mineralogy|url=http://www.handbookofmineralogy.org/|access-date=2021-12-08|website=www.handbookofmineralogy.org}}</ref><ref name=":1">{{Cite web|title=Luminescence, fluorescence and phosphorescence of minerals|url=https://www.fluomin.org/uk/fiche.php?id=62|access-date=2021-12-08|website=www.fluomin.org}}</ref> The fluorescent activator is dominantly Mn<sup>2+</sup>, with minor Eu<sup>2+</sup>, Sm<sup>3+</sup>, and Dy<sup>3+</sup>.<ref name=":1" /> |
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It is named in honour of [[Stuart Olof Agrell]] (1913–1996).<ref>first reported in the Canadian Mineralogist (1976), vol. 14, pp. 120-126</ref> |
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It is named in honor of [[Stuart Olof Agrell]] (1913–1996), a British mineralogist at Cambridge University. |
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==See also== |
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* [[List of minerals]] |
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* [[List of minerals named after people]] |
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==References== |
==References== |
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[[Category:Inosilicates]] |
[[Category:Inosilicates]] |
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[[Category:Triclinic minerals]] |
[[Category:Triclinic minerals]] |
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[[Category:Minerals in space group 2]] |
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Latest revision as of 04:39, 13 January 2024
Agrellite | |
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Agrellite showing fluorescence in ultraviolet light | |
Allgemein | |
Kategorie | 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 [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 | [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
[edit]References
[edit]![](http://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
- ^ 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.