Arfvedsonite

Arfvedsonite

Arfvedsonite is a sodium amphibole mineral with composition: Na3(Fe,Mg)4FeSi8O22(OH)2: sodium, iron, magnesium, inosilicate, hydroxide. It crystallizes in the monoclinic prismatic crystal system and typically occurs as greenish black to bluish grey fibrous to radiating or stellate prisms. It has a specific gravity of 3.44 to 3.45 and a Mohs hardness of 5.5 to 6. Refractive indices are nα=1.652 - 1.699, nβ=1.660 - 1.705, and nγ=1.666 - 1.708.

It is rather rare and occurs in alkalic igneous mineral occurring in nepheline syenite intrusions and agpaitic pegmatites and agpaitic (peralkaline) granites as the Golden Horn batholith in Okanogan county, Washington (type locality for zektzerite). Occurrences include Mont Saint-Hilaire, Quebec, Canada; the Ilimaussaq Intrusion in Southern Greenland; and in pegmatites of the Kola Peninsula, Russia. Its mineral association includes nepheline, albite, aegirine, riebeckite, katophorite, and quartz.

Arfvedsonite was discovered in 1923 and named for the Swedish chemist Johan August Arfwedson (1792-1841).

See also

* List of minerals
* List of minerals named after people

References

* Deer, W.A., R.A. Howie, and J. Zussman (1963) "Rock-forming Minerals", v. 2, "Chain Silicates", p. 364-374
* [http://rruff.geo.arizona.edu/doclib/hom/arfvedsonite.pdf Mineral Data Publishing, 2001 PDF]
* [http://www.mindat.org/show.php?id=325&ld=1&pho= Mindat with locality data]
* [http://webmineral.com/data/Arfvedsonite.shtml Webmineral data]
* [http://mineral.galleries.com/minerals/silicate/arfvedso/arfvedso.htm Mineral Galleries]


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Look at other dictionaries:

  • arfvedsonite — ˈävə̇dsəˌnīt noun ( s) Etymology: J.A.Arfvedson died 1841 Swedish chemist + English ite : a silicate of sodium, calcium, and iron, approximately Na2 3(Fe,Mg,Al)5Si8O22(OH …   Useful english dictionary

  • arfvedsonite — /ahr vid seuh nuyt /, n. Mineral. a sodium rich amphibole, occurring in green to black crystals in alkalic rocks. [1830 40; named after J. A. Arfvedson (d. 1841), Swedish chemist; see ITE1] * * * ▪ mineral       amphibole mineral, an iron rich… …   Universalium

  • arfvedsonite — noun A rare sodium amphibole mineral …   Wiktionary

  • arfvedsonite — arf·ved·son·ite …   English syllables

  • Riébeckite — Riébeckite[1] Catégorie IX : silicates[2] …   Wikipédia en Français

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  • Арфведсонит — Формула NaNa2(Mg;Fe)4Fe(OH)2(Si4O11) Сингония монокл …   Википедия

  • Amphibole — (pronounced amfi bowl) defines an important group of generally dark colored rock forming inosilicate minerals, composed of double chain SiO4 tetrahedra, linked at the vertices and generally containing ions of iron and/or magnesium in their… …   Wikipedia

  • Nepheline syenite — of the Intrusive Complex of Tanguá, State of Rio de Janeiro, Brasil (Motoki et al., 2011a) Nephelene syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar. The rocks are mostly pale colored, grey or… …   Wikipedia

  • List of minerals A-B (complete) — It is currently not possible to have a complete list of minerals . The International Mineralogical Association is the international group that recognises new minerals and new mineral names, however minerals discovered before 1959 did not go… …   Wikipedia

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