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Encyclopedia > Arfvedsonite

Arfvedsonite is a sodium amphibole mineral with composition: Na3(Fe,Mg)4FeSi8O22(OH)2: sodium, iron, magnesium, inosilicate, hydroxide. It is rather rare and occurs in igneous intrusions called nepheline syenites and agpaitic pegmatites. Occurs at Mont Saint-Hilaire, Quebec, Canada, the Ilimaussaq Intrusion, in Southern Greenland, and in pegmatites of the Kola Peninsula, Russia. General Name, Symbol, Number sodium, Na, 11 Series alkali metal Group, Period, Block 1 (IA), 3, s Density, Hardness 968 kg/m3, 0. ... Amphibole (Hornblende) Amphibole defines an important group of 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 structures. ... Minerals are natural compounds formed through geological processes. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metal Group, Period, Block 8 (VIIIB), 4, d Density, Hardness 7874 kg/m3, 4. ... General Name, Symbol, Number magnesium, Mg, 12 Series alkaline earth metals Group, Period, Block 2 (IIA), 3, s Density, Hardness 1738 kg/m³, 2. ... The silicate minerals make up the the largest and most important class of rock-forming minerals. ... Hydroxide is a polyatomic ion consisting of oxygen and hydrogen: −O−H It has a charge of −1. ... Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ... Pluton redirects here. ... Nephelite, also called nepheline, is a feldspathoid -- a silica-undersaturated aluminosilicate, Na,K) AlSiO4, that occurs in intrusive and volcanic rocks undersaturated with silica, and in their pegmatites. ... Syenite Syenite is a coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or present in relatively small amounts. ... Pegmatite is a very coarse-grained igneous rock that has a grain size of 20 mm or more; such rocks are referred to as pegmatitic. ... The Kola Peninsula in relation to Scandinavia, the White Sea, Barents Sea, Lake Onega, Lake Ladoga, and foreign countries. ...


Arfvedsonite was named after the Swedish chemist Johan August Arfwedson (1792-1841). Johan August Arfwedson (January 12, 1792 - October 28, 1841), Swedish chemist and the discoverer of lithium (1817). ...


References

  • Mindat (http://www.mindat.org/min-325.html)
  • Webmineral (http://webmineral.com/data/Arfvedsonite.shtml)
  • Mineral Galleries (http://mineral.galleries.com/minerals/silicate/arfvedso/arfvedso.htm)

  Results from FactBites:
 
ARFVEDSONITE (Sodium Iron Magnesium Silicate Hydroxide) (456 words)
Arfvedsonite however is of limited distribution compared to most of the other common members of the group.
Arfvedsonite is generally not the mineral of interest on these specimens, but it does make for a wonderful accessory mineral to the many rare and exotic species.
The chemistry of arfvedsonite is odd in another way in that it includes two different iron atoms.
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