mineral
Arfvedsonite
Na3(Fe2+4Fe3+)Si8O22(OH)2
AI-generated identification · may be incorrectHardness of 5.5 to 6 on the Mohs scale, dark green to black color, vitreous luster, monoclinic crystal system, and perfect prismatic cleavage.
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Physical properties
Hardness of 5.5 to 6 on the Mohs scale, dark green to black color, vitreous luster, monoclinic crystal system, and perfect prismatic cleavage.
Formation & geological history
Forms in sodium-rich alkaline igneous rocks such as syenites and granitic pegmatites during late-stage crystallization.
Uses & applications
Primarily used as a collectible mineral specimen and fashioned into polished beads for gemstone jewelry.
Geological facts
Arfvedsonite is named after the Swedish chemist Johan August Arfwedson, the discoverer of lithium.
Field identification & locations
Identified by its dark fibrous or prismatic crystals and association with other alkaline minerals, commonly found in Greenland, Canada, and Russia.
